Therefore, the total number of ways to select 2 cooked and 3 uncooked eggs is 210 ways.
What is combination?In mathematics, a combination is a way of selecting items from a collection, such that (unlike permutations) the order of selection does not matter. In other words, a combination is a selection of items from a larger set, without regard to the order in which they are chosen. The number of combinations of size r that can be chosen from a set of n elements is denoted by the symbol C(n, r), and is given by the formula:
C(n, r) = n! / (r! * (n-r)!)
where n! (pronounced "n factorial") is the product of all positive integers up to n, and r! is the product of all positive integers up to r.
Here,
a) To find the number of ways to select 2 cooked or 3 uncooked eggs, we need to use the combination formula, which is:
ⁿCₓ= n! / r!(n-r)!
where n is the total number of eggs, r is the number of eggs we want to select, and ! represents factorial.
For 2 cooked eggs, we can select them in:
⁷C₂ = 7! / 2!(7-2)! = 21 ways
For 3 uncooked eggs, we can select them in:
⁵C₃ = 5! / 3!(5-3)! = 10 ways
Therefore, the total number of ways to select 2 cooked or 3 uncooked eggs is:
21 + 10 = 31 ways
b) To find the number of ways to select 2 cooked and 3 uncooked eggs, we need to use the product rule of counting. That is, we need to multiply the number of ways to select 2 cooked eggs and 3 uncooked eggs.
The number of ways to select 2 cooked eggs is:
⁷C₂ = 21 ways
The number of ways to select 3 uncooked eggs is:⁵C₃ = 10 ways
Therefore, the total number of ways to select 2 cooked and 3 uncooked eggs is:
21 x 10 = 210 ways
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russell is doing some research before buying his first house. he is looking at two different areas of the city, and he wants to know if there is a significant difference between the mean prices of homes in the two areas. for the 40 homes he samples in the first area, the mean home price is $183,100. public records indicate that home prices in the first area have a population standard deviation of $21,845. for the 33 homes he samples in the second area, the mean home price is $161,500. again, public records show that home prices in the second area have a population standard deviation of $24,820. let population 1 be homes in the first area and population 2 be homes in the second area. construct a 95% confidence interval for the true difference between the mean home prices in the two areas. round the endpoints of the interval to the nearest whole number, if necessary.
Confidence Interval: The confidence interval for the true difference between the mean home prices in the two areas at a 95% confidence level is given as [tex]16,322 < \mu_1 - \mu_2 < 31,338.[/tex]
Given: Population 1: [tex]n_1 = 40, \mu_1 = 183,100, \sigma_1 = 21,845[/tex]
Population 2: [tex]n_2 = 33, \mu_2 = 161,500, \sigma2 = 24,820[/tex]
To construct a 95% confidence interval for the true difference between the mean home prices in the two areas, we need to calculate the sample mean difference between the two populations, as well as the standard error.
The sample mean difference is given by: [tex]\bar{x}_1 - \bar{x}_2 = 183,100 - 161,500 = 21,600[/tex]
The standard error is given by: [tex]s = \sqrt{\frac{s_1^2}{n_1} + \frac{s_2^2}{n_2}} \\s= \sqrt{\frac{21,845^2}{40} + \frac{24,820^2}{33}} = 8,205[/tex]
Using the standard normal distribution table, with a confidence level of 95%, we obtain a z-score of ±1.96. Using these values, the 95% confidence interval for the true difference between the mean home prices in the two areas is given by: 21,600 - (1.96 * 8,205) < μ1 - μ2 < 21,600 + (1.96 * 8,205)
Solving for the inequality, we get 16,322 < μ1 - μ2 < 31,338
Therefore, the confidence interval for the true difference between the mean home prices in the two areas at a 95% confidence level is given as $16,322 < μ1 - μ2 < $31,338.
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Factorise fully - 4x² - 16x
Answer: 4x(x - 4)
Step-by-step explanation:
4x² - 16x = 4x(x - 4)
Now we can see that the expression inside the parentheses can also be factored:
x - 4 = (x - 4)
So the fully factorized expression is:
4x² - 16x = 4x(x - 4) = 4x(x - 4)
Answer:
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- 4x( x + 4 )
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Step-by-step explanation:
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[tex]\large{\pmb{\sf{ - 4x^{2} - 16x}}}[/tex]
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[tex]\large{\underline{\underline{\sf{Taking \: Out \: {\green{4}} \: As \: Common:-}}}}[/tex]
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[tex]\large{\pmb{\sf{\leadsto{- 4(x^{2} + 4x)}}}}[/tex]
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[tex]\large{\underline{\underline{\sf{Taking \: Out \: {\green{x}} \: As \: Common:-}}}}[/tex]
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[tex]\large{\purple{\boxed{\pmb{\sf{\leadsto{- 4x(x + 4)}}}}}}[/tex]
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[tex]\star \: {\large{\underline{\underline{\pink{\mathfrak{More:-}}}}}} \: \star[/tex]
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[tex]\large{\dashrightarrow}[/tex] Two positive always makes positive sign when multiplied.
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[tex]\large{\dashrightarrow}[/tex] Two negatives always makes positive sign when multiplied.
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[tex]\large{\dashrightarrow}[/tex] A positive and a negative always makes negative sign when multiplied.
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[tex]\large{\dashrightarrow}[/tex] The sum of two positives is always positive with a positive sign.
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[tex]\large{\dashrightarrow}[/tex] The sum of two negatives is always positive with a negative sign.
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[tex]\large{\dashrightarrow}[/tex] The sum of a positive and a negative is always negative with the sign of whose number is greater.
i have an assignment, its 2n + 10 = 90 our teacher is asking whats the n can someone help, with solutions is okay :)
Answer: n=40
Step-by-step explanation:
let me know if i got this right for you broski
now dance
I need the answer to this question(PLEASE IM BEGGING YOU)
Answer:
B & D
Step-by-step explanation:
For future reference, you can just a site called desmos. It has a graphing tool where you can just write the function and then check where the lines meet.
Let a function f be analytic everywhere in a domain D. Prove that if f(z) is real-valued for all z in D, then f(z) must be constant throughout D.
By using the Cauchy-Riemann equations on a real-valued function, it can be proven that the function f(z) is constant in the domain D. This is important for understanding analytic functions in complex analysis.
To prove that if f(z) is real-valued for all z in D, then f(z) must be constant throughout D, let a function f be analytic everywhere in a domain D. We know that a real-valued function is said to be a function whose values lie on the real line. In the case of the complex plane, a function whose values lie on the real line is real-valued.
The Cauchy-Riemann equations, which define the necessary conditions for a function f(z) to be analytic in a domain, say that the imaginary component of f(z) is determined by its real component.
To be more precise, if f(z) is real-valued for all z in D, then we can say that:u(x, y) = f(z),v(x, y) = 0
By definition, the Cauchy-Riemann equations can be stated as:
∂u/∂x = ∂v/∂y∂u/∂y = -∂v/∂x
Taking the first equation, we get:
∂u/∂x = ∂v/∂y => ∂v/∂y = 0
Since v is equal to 0 for all values of x and y, the above equation reduces to ∂u/∂x = 0, which implies u is constant with respect to x.
Similarly, taking the second equation, we get:
∂u/∂y = -∂v/∂x => ∂u/∂y = 0
Since u is equal to a constant for all values of x and y, the above equation reduces to ∂v/∂y = 0, which implies v is constant with respect to y. Since u and v are both constant with respect to their respective variables, u + iv = f(z) is a constant with respect to z throughout the domain D. Thus, we have proved that if f(z) is real-valued for all z in D, then f(z) must be constant throughout D.
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See the image posted
The probability that both bulbs are red is 0.126 and The probability that the first bulb selected is red and the second yellow is 0.113
What is Probability?Probability means the possible outcome occur when an event take place.
(a) The probability that both bulbs are red ,
= 11/30 * 10/29
= 11/87
= 0.126
So, The probability that both bulbs are red is 0.126
(b) The probability that the first bulb selected is red and the second yellow,
= 11/30 * 9/29
= 33/290
= 0.113
So, The probability that the first bulb selected is red and the second yellow is 0.113
(c) The probability that the first bulb selected is yellow and the second red,
= 9/30 * 11/29
= 33/290
= 0.113
So, The probability that the first bulb selected is yellow and the second red is 0.113
(d) The probability that one bulb is red and the other yellow,
= 33/290 + 33/290 ( Add (b) and (c) )
= 33/145
= 0.227
And, The probability that one bulb is red and the other yellow is 0.227 .
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Find the missing side of each triangle round your answers to the nearest 10th
The image shows triangle ABC.
1. Sketch the result of dilating triangle ABC using a scale factor of 2 and a center of A. Label it AB'C'.
2. Sketch the result of dilating triangle ABC using a scale factor of -2 and a center of A. Label it AB"C".
3. Find a transformation that would take triangle AB'C' to AB"C".
The triangle ΔA'B'C' formed following the dilation of ΔABC is a similar
triangle to ΔABC.
What are the correct responses?. a. Please find attached the drawing of the dilated triangle ΔA'B'C', created with MS Excel
b. The properties of dilations indicate that ∠B = ∠B'
Reasons:
a. With the assumption that the vertices of the triangle are;
A(0, -3), C(0, 5), and B(6, 3)
Let point P = (0, 0)
A' = 2/3 *(0,-3) = (0, -9/2) (0, -4.5)
C' = 2/3 *(0,5) = (0, 15/2) (0, 7.5)
B' = 2/3 *(6,3) = (9, 9/2) (9, 4.5)
We have;
b. From the attached diagram, and from the properties of dilation, given
that the image of ΔABC is larger than the image of ΔA'B'C' by a scale
factor of 1.5, we have that the ratio of the corresponding sides of ΔABC
and ΔA'B'C' are equal and therefore the angle formed by segment BC and BA which is ∠B and the angle formed by segment B'C' and B'A' which is ∠B'. are equal.
AC/AB = A'C'/A'B'
AC/Sin(B) = AB/Sin (C)
AC/AB = Sin(B)/Sin(C)
Similarly, we have;
A'C'/A'B' = Sin(B')/Sin(C')
Therefore;
Sin(B)/Sin(C) = Sin(B')/Sin(C')
According to the properties of dilation, ∠B = ∠B'
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The population of a town grows at a rate proportional to the population present at time t. The initial population of 500 increases by 10% in 10 years. what will be the population in 60 years? (Round your answer to the nearest person.) ______ persons How fast is the population growing at t = 607(Round your answer to two decimal places.) ______persons/yr
When the initial population increases by 10% in 10 years, it is growing at a rate of approximately 78.04 persons per year at t = 60.
To find the population in 60 years, we need to use the formula:
P(t) = P0rt
P0 is the initial population
r is the rate of growth
t is the time in years.
So, given that the initial population of 500 increases by 10% in 10 years, we can find r as follows:
10% increase in 10 years means that the population has grown to (100% + 10%) = 110% of its original size in 10 years.
Therefore, we have:
P(10) = 500(1 + 0.10)
= 550
Now we can use these values to solve for:
r: 550 = 500er
⇒ er = 550/500
⇒ r = ln(550/500)/10
= 0.04879 (rounded to 5 decimal places)
Therefore, the population in 60 years is:
P(60) = 500e0.04879 × 60 ≈ 1599 (rounded to the nearest person)
The population is growing at a rate of:
P'(t) = rP(t),
so at t = 60, we have:
P'(60) = 0.04879 × 1599 ≈ 78.04 (rounded to two decimal places)
Therefore, the population is growing at a rate of approximately 78.04 persons per year at t = 60.
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if you have 25 revolutions in 15 seconds, what is the frequency of rotations in rev/s? (hint: answer should be in two significant figures.)
The frequency of rotations in rev/s for 25 revolutions in 15 seconds is 1.7 rev/s (to two significant figures).
How to find the frequency of rotations:
To determine the frequency of rotations, we divide the number of revolutions by the duration, which is in seconds.
We get a unit of revolutions per second, which is abbreviated as rev/s.
To solve this question, we will use the following formula:
Frequency of rotations (in rev/s) = the number of revolutions ÷ duration
First, we substitute the given values into the formula:
F = 25 ÷ 15
The number of revolutions is 25, and the duration is 15 seconds.
After that, we simplify:
F = 5/3
Next, we convert the fraction to two significant figures, which is 1.7 (rounded to one decimal place).
Therefore, the frequency of rotations in rev/s is 1.7 rev/s (to two significant figures).
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Mia volunteers on the weekend at the Central Library. As a school project, she decides to record how many people visit the library, and where they go. On Saturday, 470 people went to The Youth Wing, 413 people went to Social Issues, and 350 went to Fiction and Literature. On Sunday, the library had 400 total visitors. Based on what Mia had recorded on Saturday, about how many people should be expected to go to The Youth Wing? Round your answer to the nearest whole number
Based on what Mia recorded, we calculate that 152 people are expected to go to the Youth wing on Sunday.
We solve this problem using simple arithmetic methods. According to the data collected by mia,
The number of people who went to the "Youth wing" = 470
The number of people who went to "Social issues" = 413
The number of people who went to "Fiction and Literature" = 350
So, the total number of visitors that the library had on Saturday was,
470+413+350 = 1233
Hence, the proportion of people who went to the "Youth wing", "Social issues" and "Fiction and Literature" are (470/1233), (413/1233), (and 350/1233) respectively.
So, on Sunday the expected number of people who may go to the "Youth wing" should be,
(470/1233)×400
= 152.47 ≈ 152
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The village of Hampton has 436 families 238 of the families live within 1 mile of the village square use mental math to find how many families live farther than 1 mile from the square show your work
Answer: 198 families live farther than 1 mile from the square.
Step-by-step explanation:
We know that there are 238 families that live within 1 mile of the village square. To find the number of families that live farther than 1 mile from the square, we can subtract 238 from the total number of families:
436 - 238 = 198
Therefore, 198 families live farther than 1 mile from the square. We can do this subtraction mentally without needing a calculator.
find the product. Write your answer in scientific notation (5 x 10^-7) x (3 x 10^6)
3. The population of bees has been increasing by 5% each year since 2010. There were 1,000 bees counted in 2010. a. Create an explicit formula that models the bee population for n years since 2010. (Hint: What function have we studied that can be represented by this situation?)
Answer: 1000 x 1.05^n
Step-by-step explanation:
1.05 is the increase experienced each year and n is the number of years.
Answer:
The population of bees is increasing by 5% each year since 2010. Let P(n) be the population of bees in the nth year since 2010.
The explicit formula for the bee population can be found using the formula for compound interest:
P(n) = P(0) * (1 + r)^n
where P(0) is the initial population in 2010, r is the annual growth rate, and n is the number of years since 2010.
Substituting the given values, we have:
P(n) = 1000 * (1 + 0.05)^n
Simplifying the expression, we get:
P(n) = 1000 * 1.05^n
Therefore, the explicit formula that models the bee population for n years since 2010 is P(n) = 1000 * 1.05^n.
Please help it’s for tmr
Leo has a number of toy soldiers between 27 and 54. If you want to group them four by four, there are none left, seven by seven, 6 remain, five by five, 3 remain. How many toy soldiers are there?
The answer is 48 but I need step by step explanation
Hence, 28 toy soldiers are the correct answer.
In mathematics, how is a group defined?A group in mathematics is created by combining a set with a binary operation. For instance, a group is formed by a set of integers with an arithmetic operation and a group is also formed by a set of real numbers with a differential operator.
Let's refer to the quantity of toy soldiers as "x".
We are aware that x is within the range of 27 and 54 thanks to the problem.
x can be divided by 4 without any remainders.
The residual is 6 when x is divided by 7.
The leftover after dividing x by five is three.
These criteria allow us to construct an equation system and find x.
Firstly, we are aware that x can be divided by 4 without any residual. As a result, x needs to have a multiple of 4. We can phrase this as:
x = 4k, where k is some integer.
Secondly, we understand that the remaining is 6 when x is divided by 7. This can be stated as follows:
x ≡ 6 (mod 7)
This indicates that x is a multiple of 7 that is 6 more than. We can solve this problem by substituting x = 4k:
4k ≡ 6 (mod 7)
We can attempt several values of k until we discover one that makes sense for this equation in order to solve for k. We can enter k in to equation starting using k = 1, as follows:
4(1) ≡ 6 (mod 7)
4 ≡ 6 (mod 7)
It is not true; thus we need to attempt a next value for k. This procedure can be carried out repeatedly until the equation is satisfied for all values of k.
k = 2:
4(2) ≡ 6 (mod 7)
1 ≡ 6 (mod 7)
k = 3:
4(3) ≡ 6 (mod 7)
5 ≡ 6 (mod 7)
k = 4:
4(4) ≡ 6 (mod 7)
2 ≡ 6 (mod 7)
k = 5:
4(5) ≡ 6 (mod 7)
6 ≡ 6 (mod 7)
k = 6:
4(6) ≡ 6 (mod 7)
3 ≡ 6 (mod 7)
k = 7:
4(7) ≡ 6 (mod 7)
0 ≡ 6 (mod 7)
We have discovered that the equation 4k 6 (mod 7) is fulfilled when k = 7. Thus, we can change k = 7 to x = 4k to determine that:
x = 4(7) = 28
This indicates that there are 28 toy troops. Yet we also understand that the leftover is 3 when x is divided by 5. We don't need to take into account any other values of x because x = 28 satisfies this requirement.
28 toy soldiers are the correct response.
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The city plans a new road that will be parallel to Village Way and pass through the intersection of Gray Dr and Canon Rd. What is the equation of the road in slope-intercept form?
The equation line of the of the road in slope-intercept form is; y = 2·x - 10
What is the standard form of the equation of a line?The standard form of the equation of a line is Ax + Bx + C, where A, B, and C are constants and A and B are nonzero numbers.
The parameters for the new road are;
The road will be parallel to village way with points (0, 5), and (-4, -3)
The road will pass through the intersection of Gray Dr and Canon Rd., which is the point with coordinates (3, -4)
Required; The equation of the road
Since the new road is parallel to Village Way, which has slope;
m = (5 - (-3))/(0 - (-4)) = 8/4 = 2
The slope of the new road will also be 2.
Let the equation of the new road be y = m·x + c, where m = 2 is the slope we just found. To find c, we use the fact that the road passes through the point (3, -4);
y - (-4) = 2 × (x - 3)
y = 2·x - 6 - 4 = 2·x - 10
y = 2·x - 10
Therefore, c = -10
Therefore, the equation of the new road in slope-intercept form, therefore is; y = 2·x - 10
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Simplify 4 triangles to 16 squares
The expression 4 triangles to 16 squares when simplified is 1 triangle to 4 squares
How to simplify the expressionGiven that
4 triangles to 16 squares
When expressed as ratio, we have
Triangle : Square = 4 : 16
To simplify the ratio Triangle : Square = 4 : 16, we can divide both the numerator and denominator by their greatest common factor, which is 4.
So, we have
Triangle : Square = 4 : 16
Divide both sides by 4:
Triangle/4 : Square/4 = 1 : 4
So the simplified ratio is 1 : 4, which means for every one triangle, there are four squares.
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a commercial kitchen uses 3/4 of a cup of milk every 4/6 of a minute. how many cups of milk are used per minute answer key
The amount of milk used per minute in a commercial kitchen that uses 3/4 of a cup of milk every 4/6 of a minute is 1/2 cup of milk.
How many cups of milk are used per minute?In a recipe or cooking, fractions are frequently used. We can use them to measure ingredients such as sugar, butter, milk, and other items. The numerator of the fraction refers to the number of parts that are utilized. The denominator, on the other hand, refers to the whole.
The fraction 3/4 can be defined in the following ways: 3 parts out of 4 parts,75 parts out of 100 parts,15 parts out of 20 parts,The fraction 4/6 can be reduced as:4/6 = (4 ÷ 2)/(6 ÷ 2) = 2/3Thus, the fraction 4/6 represents 2/3 or two parts out of three parts.
We can use proportions to figure out how many cups of milk are used per minute. To do that, we need to convert the given quantity of milk into a fraction that represents the amount of milk used per minute
The kitchen uses 3/4 of a cup of milk every 4/6 of a minute.=> The fraction that represents the amount of milk used per minute = [3/4 ÷ 4/6]=> Multiplying the numerator and denominator of the above fraction by 6, we get:[3/4 ÷ 4/6] = [3/4 × 6 ÷ 4/6 × 6] = [18/24 ÷ 24/24] = 18/24= 3/4 (Reduced Form)Therefore, 3/4 of a cup of milk is used per 4/6 of a minute, or 1/2 cup of milk per minute, if we simplify it further.
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Write 0. 0166 correct to two significant figures.
0.0166 correct to two significant figures is 0.016.
To write 0.0166 to two significant figures, we need to look at the first two significant digits of the number, which are 1 and 6.
Since the digit after 6 is less than 5, we round down the last significant digit (6) to get:
0.016
Therefore, 0.0166 correct to two significant figures is 0.016.
Significant figures (also known as the significant digits, precision or resolution) of a number in positional notation are digits in the number that are reliable and necessary to indicate the quantity of something.
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if the circumference of the moon is 6783 miles what is its diameter in miles
Answer:
C = 21,309.4
Step-by-step explanation:
Diameter of moon is miles is,
d = 2159.8 miles
We have,
The circumference of the moon is, 6783 miles
Since, We know that,
the circumference of circle is,
C = 2πr
Substitute given values,
6783 miles = 2 × 3.14 × r
6783 = 6.28 × r
r = 6783 / 6.28
r = 1079.9 miles
Therefore, Diameter of moon is miles is,
d = 2 x r
d = 2 x 1079.9
d = 2159.8 miles
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answer quickly please
Answer:
m = -3/4
Step-by-step explanation:
Slope = rise/run or (y2 - y1) / (x2 - x1)
Pick 2 points (0, -2) (-3,2)
We see the y increase by 4 and the x decrease by 3, so the slope is
m = -3/4
Solve the system of equations shown below using graphing and substitution. y=2x+3 and y=15-x
Answer: -17x+3
Step-by-step explanation:
y=2x+3 and y=15-x
15x-2x+3
-17x+3
you can try this
a) Work out the minimum number of hikers who could have walked between 6 miles and 17 miles. b) Work out the maximum number of hikers who could have walked between 6 miles and 17 miles. < Back to task Distance, a (miles) 0≤ x<5 5 ≤ x < 10 10 ≤ a < 15 15 ≤ x < 20 20 ≤ w Scroll down Watch video Frequency 3 2 9 8 4 Answer
9 hikers are the bare minimum that might have covered the range of 6 to 17 miles because that distance falls inside the typical interval of 10 x 15 miles.
What is meant by minimum and maximum value?Rearrange the function using fundamental algebraic concepts to determine the value of x when the derivative equals 0.
This response gives the x-coordinate of the function's vertex, which is where the maximum or minimum will occur.
To determine the minimum or maximum, rewrite the solution into the original function.
The greatest and smallest values of a function, either within a specific range (the local or relative extrema) or throughout the entire domain, are collectively referred to as extrema (PL: extrema) in mathematical analysis.
b) the maximum number of hikers who could have walked between 6 miles and 17 miles is 19.
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The table shows the costs of different camping activities. Over the summer, Maura canoed 4 times and fished 3 times. Write and evaluate an expression that represents the total cost Maura spent canoeing
and fishing.
Answer:
Step-by-step explanation:
Here goes:
So, we want to write out an expression for this situation. I'm not exactly sure what you've been taught in class, but personally, I would start out with a let statement looking something like this:
Let x = the total cost Maura spent canoeing and fishing.
From there, we know you have 4 canoeing and 3 fishing trips. From here, we just plug in numbers for what we know. So, we get an equation that looks like this:
4(8) + 3(5) = x
Now, this is an equation, however, if you just had an expression like the question asked for, there wouldn't be anything to evaluate. Plus, it's always kind of satisfying to get a number answer. So, with a little bit of math, we get 32+15 = x, and a grand total of 47 = x.
Forgot what x was? Thank goodness you wrote a let statement. Look back up if you need the refresher.
Finally, if you need any other clarification, feel free to reach out with another question.
what is the target domain for a poisson distribution?
The target domain for a Poisson distribution is given the term (0, inf) which can be seen correct in option B.
A Poisson distribution's target domain is (0, inf). This means that the Poisson distribution can only be specified for non-negative integer values of the random variable it is modelling.
The Poisson distribution is a discrete probability function, which indicates that the variable may only take particular values from a finite list of integers. A Poisson distribution estimates how many times an event will occur in "x" amount of time. In other words, it is the probability distribution resulting from the Poisson experiment.
A Poisson experiment is a statistical experiment that categorises the experiment as either successful or unsuccessful. A limiting process of the binomial distribution is the Poisson distribution.
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Complete question:
What is the target domain for a Poisson distribution?
1) (-inf, inf)
2) (0, inf)
3) (-inf, 0]
4) [0, inf)
a study on students drinking habits asks a random sample of 60 male uf students how many alcoholic beverages they have consumed in the past week. the sample reveals an average of 5.84 alcoholic drinks, with a standard deviation of 4.98. construct a 95% confidence interval for the true average number of alcoholic drinks all uf male students have in a one week period.
The 95% confidence interval for the true average number of alcoholic drinks all UF male students have in a one week period is (4.58, 7.10) that is option C.
Using the following formulas the lower and upper limits of the Interval are calculated,
n = 60
x = 5.84
s = 4.981 = 95% = 0.95
Because the population standard deviation is unknown, the Student T-distribution should be used. Yet, because the sample is huge, some books will utilise the normal distribution. I'll provide solutions for both techniques.
Error = z x s/√n
= 1.96 x 4.98/√60
Error margin ≈1.26
Lower limit = 5.84 - Error
= 5.54 - 1.2601
= 4.58
Upper limit = 5.84 + Error
= 5.84 + 1.2601
= 7.10
Therefore, the upper limit and lower limit is 4.58 and 7.10.
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Complete question:
A study on students drinking habits asks a random sample of 60 male UF students how many alcoholic beverages they have consumed in the past week. The sample reveals an average of 5.84 alcoholic drinks, with a standard deviation of 4.98. Construct a 95% confidence interval for the true average number of alcoholic drinks all UF male students have in a one week period.
A. (4.78, 6.90)
B. (0, 15.60)
C.(4.58, 7.10)
D. (-3.92, 15.60)
determine the smallest integer value of x in -2x+1< -9
Answer: The smallest integer value of x that satisfies the inequality -2x+1<-9 is x=5.
Step-by-step explanation:
Answer: The smallest integer value of x that satisfies the inequality -2x+1<-9 is x=5.
Explanation:
To solve the inequality, we need to isolate the variable x on one side of the inequality symbol. Here are the steps:
Subtract 1 from both sides of the inequality:
-2x < -10
Divide both sides of the inequality by -2, remembering to reverse the direction of the inequality symbol:
x > 5
Therefore, the smallest integer value of x that satisfies the inequality is x = 5, since any value less than 5 would make the inequality false.
Answer:
x = 6
Step-by-step explanation:
- 2x + 1 < - 9 ( subtract 1 from both sides )
- 2x < - 10
divide both sides by - 2, reversing the symbol as a result of dividing by a negative quantity.
x > 5
since x must be greater than 5, it cannot equal 5
then the smallest integer value of x is x = 6
From the roof a house 10 m. high, a man observes two cars on the ground, both due west the same line at angles of depression of 45° and 30° .How far apart are the two cars? Find it.
Step-by-step explanation:
hey, you just changed the angles in the question.
this following answer was about the angles of depression of 15° and 30°.
you cannot change the problem, when the answers are already given for the original problem.
so, I will add a copy with the adapted numbers for 45° and 30° after my original answer.
this creates 2 right-angled triangles.
the right angle is in both cases the angle where house meets the ground.
they also share one leg : the height of the house (10 m).
the second legs are the ground distances of the cars from the house.
the 2 Hypotenuses are the line of sight from the roof to the corresponding car.
remember, the sum of all angles in a triangle is always 180°.
again, we know one angle : the 90° angle.
but we also know a second angle based on the angles of depression (the "downward looking angles").
the triangle internal angle at the rooftop is the complementary angle (the difference to 90°) of the angle of depression.
so, this is 90-15 = 75° and 90-30 = 60°.
the angles at the cars on the ground are then
angle car 1 = 180 - 90 - 75 = 15°
angle car 2 = 180 - 90 - 60 = 30°
now, remember the trigonometric triangle inscribed in a circle.
imagine that the vertex at the car is the center of the corresponding circle around the trigonometric triangle.
the height of the house is then sine of the angle at the car multiplied by the Hypotenuse (= the line is sight from the rooftop to the car), which is the angle creating radius of the circle.
and the ground distance is the cosine of that same angle multiplied by the Hypotenuse.
so, we need to get the ratio of the height of the house / sin(car angle) to get the length of the Hypotenuse (line of sight). with that we can then calculate the ground distance as cosine of the angle multiplied by the same Hypotenuse.
for car 1 we have
10m/sin(15) = 38.63703305... m line of sight
that means ground distance of car 1 is
cos(15)×38.63703305... = 37.32050808... m
for car 2 we have
10m/sin(30) = 20 m line of sight
that means ground distance of car 2 is
cos(30)×20 = 17.32050808... m
since both cars are driving on the same side of the house in the same direction, the distance between both cars is purely the difference between their distances from the house :
37.32050808... - 17.32050808... = 20 m
the cars are 20 m apart.
and now for the angles of depression of 45° and 30° :
the triangle internal angle at the rooftop is the complementary angle (the difference to 90°) of the angle of depression.
so, this is 90-45 = 45° and 90-30 = 60°.
the angles at the cars on the ground are then
angle car 1 = 180 - 90 - 45 = 45°
angle car 2 = 180 - 90 - 60 = 30°
now, remember the trigonometric triangle inscribed in a circle.
imagine that the vertex at the car is the center of the corresponding circle around the trigonometric triangle.
the height of the house is then sine of the angle at the car multiplied by the Hypotenuse (= the line is sight from the rooftop to the car), which is the angle creating radius of the circle.
and the ground distance is the cosine of that same angle multiplied by the Hypotenuse.
so, we need to get the ratio of the height of the house / sin(car angle) to get the length of the Hypotenuse (line of sight). with that we can then calculate the ground distance as cosine of the angle multiplied by the same Hypotenuse.
for car 1 we have
10m/sin(45) = 14.14213562... m line of sight
that means ground distance of car 1 is
cos(45)×14.14213562... = 10 m
logically, as for 45° sine and cosine are equal.
for car 2 we have
10m/sin(30) = 20 m line of sight
that means ground distance of car 2 is
cos(30)×20 = 17.32050808... m
since both cars are driving on the same side of the house in the same direction, the distance between both cars is purely the difference between their distances from the house :
17.32050808... - 10 = 7.32050808... m
≈ 7.32 m
the cars are about 7.32 m apart.
The number of members f(x) in a local swimming club increased by 30% every year over a period of x years. The function below shows the relationship between f(x) and x:f(x) = 10(1.3)xWhich of the following graphs best represents the function? (1 point)a Graph of f of x equals 1.3 multiplied by 10 to the power of xb Graph of exponential function going up from left to right in quadrant 1 through the point 0, 0 and continuing towards infinityc Graph of f of x equals 10 multiplied by 1.3 to the power of xd Graph of f of x equals 1.3 to the power of x
The graph of an exponential function with an initial value of 10 and a base of 1.3z. Therefore option D is correct.
The function f(x) is an exponential function with a base of 1.3 and an initial value of 10. The graph of an exponential function with a base greater than 1 increases rapidly as x increases. Therefore, option a can be eliminated.
Option b is not a graph of an exponential function, as the function is not continuous and does not approach any asymptote.
Option c shows an exponential function with an initial value of 10 and a base of 1.3/10, which is less than 1. This means that the function would decrease over time, which is not consistent with the problem statement.
Option d shows an exponential function with an initial value of 10 and a base of 1.3, which is consistent with the problem statement. Therefore, option d is the correct answer.
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a cup of hot coffee is placed outside where the temperature is 0, assume the coffee cools to approach the outside temperature according to an exponential decay model, if the continuous rate of cooling is determined to be 2 percent per minute and the current temperature of the coffee is 54.8 celsius how many minutes will the coffee cool to 44.9 Celsius
It will take approximately 27.7 minutes for the coffee to cool from 54.8°C to 44.9°C when following exponential decay model.
What is exponential decay?A quantity declines over time proportionate to its existing value through a process known as exponential decay. An exponential function of the form f(t) = ab raised to t, where an is the beginning value, b is the decay factor (a number between 0 and 1), and t represents time, mathematically describes this.
Several real-world circumstances, like population increase, radioactive decay, and the loss of electrical charge in a capacitor, exhibit exponential decay.
Given that the situation follows a exponential decay model.
The exponential decay is given as:
[tex]T(t) = T0 * e^{(-rt)}[/tex]
Substituting the values T0 = 54.8, r = 0.02, and T(t) = 44.9.
[tex]44.9 = 54.8 * e^{(-0.02t)}\\0..8208 = e^{(-0.02t)}\\ln(0.8208) = -0.02t\\t = ln(0.8208)/(-0.02) = 27.7 minutes[/tex]
Hence, it will take approximately 27.7 minutes for the coffee to cool from 54.8°C to 44.9°C.
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