Answer: 5 ≥ y-2 is equivalent to y ≤ 7.
Step-by-step explanation: To check if 5 is greater than or equal to y-2, we need to isolate the variable y on one side of the inequality sign.
5 ≥ y - 2
First, we can add 2 to both sides to get rid of the subtraction of 2 on the right side:
5 + 2 ≥ y - 2 + 2
7 ≥ y
Therefore, we can see that y is less than or equal to 7 for this inequality to hold true.
Work out the fraction and ratio that
complete the equations below.
Give each answer in its simplest form.
a) h:k=5:6
h =
k
b) 2x=9y
x:y
=
:
The fraction and ratio that complete the equations in its simplest term is 5/6k and 2 : 9 respectively.
What is the fraction and ratio that complete the equations?h : k = 5 : 6
h/k = 5/6
cross product
h × 6 = k × 5
6h = 5k
divide both sides by 6
h = 5/6k
Then,
2x = 9y
2/9 = x/y
2 : 9 = x : y
Ultimately, the simplest form of fraction and ratio which completes the equation is 5/6k and 2:9.
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A system of equations is shown below.
y=4x
y=x-6
what is the x-value in the solution to the system?
Answer: x = -2
Step-by-step explanation:
Since both equations are in the y-slope form,
we can use substitution for y in finding x.
Hence,
4x=x-6
4x-x=x-x-6
Subtract x from both sides to get x on one side and integer on one side.
[tex]\frac{3x}{3} =\frac{-6}{3}[/tex]
Divide 3 to find the value of x
x=-2
Mark wants to buy a new pair of sneakers that cost 215. His aunt gave him 100 for the sneakers. Market also lnow sthat he can esrn 16 for each hour that he works at his aunts store how many full hours must mark work to buy the sneakers
Mark needs a total amount of 215 to buy sneakers and we know that his aunt gave him 100 for the same, he also know that he can earn 16 for each hour that he works at his aunt's store, therefore he needs to work 8 hours.
Mark needs a total amount of 215 to buy sneakers and we know that his aunt gave him 100 for the same,
therefore, we can say that 215 - 100 = 115
therefore, Mark now needs only 115 for him to buy sneakers and now we need to find how many full hours do Mark need to work to buy sneakers:
therefore, we need to divide 115 by 16 to find out the hours he needs to work at his aunt's store:
115/16 = 7.2
we get 7.2 which also means 7 hours 20 mins but we need to find full hours Mark needs to work, that will be:
8 hours.
Therefore, we know that Mark needs to work 8 full hours for him to buy sneakers.
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Darnel is studying the movement of glaciers, which are bodies of dense ice. The median
annual movement of the Blue Valley Glacier is about 300.2 feet, and the interquartile range is
14 feet. The median annual movement of the Silver Lake Glacier is about 300.4 feet, and the
interquartile range is about 14 feet.
4) What can you conclude from these statistics? Complete the sentence.
Over a year, the Blue Valley Glacier typically moves about
the Silver Lake Glacier, and Blue Valley has
its annual movement compared to Silver Lake.
as
▾ variability in its annual movement compared to silver lake
Over a year, the Blue Valley Glacier typically moves about the same distance as the Silver Lake Glacier, and Blue Valley has the same variability in its annual movement compared to Silver Lake.
How to interpret the statisticsThe median annual movement of the Blue Valley Glacier is 300.2 feet, and the interquartile range is 14 feet.
The interquartile range indicates the spread of the data within the middle 50% of the data
So we know that the annual movement of the Blue Valley Glacier falls within a range of 300.2 ± 7 feet (i.e. 293.2 to 307.2 feet)
Similarly, the median annual movement of the Silver Lake Glacier is 300.4 feet, and the interquartile range is also 14 feet
So the annual movement of the Silver Lake Glacier also falls within a range of 300.4 ± 7 feet (i.e. 293.4 to 307.4 feet)
Since the ranges for both glaciers overlap and have the same size, we can conclude that they typically move about the same distance over a year, and that the variability in the annual movement of Blue Valley is comparable to that of Silver Lake.
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A barista mixes 12lb of his secret-formula coffee beans with 15lb of another bean that sells for $18 per lb. The resulting mix costs $20 per lb. How much does the barista's secret-forumula means cost per pound?
Answer:
The baristas secret formula beans cost per pound is $19.2.
Step-by-step explanation:
Given is that a barista mixes 12 lb of his secret-formula coffee beans with 15 lb of another bean that sells for $18 per lb.The cost of 1 pound of another bean as -$(15/18) = $(5/6)Assume that 1 pound of secret coffee costs ${x}. So, we can write -x + 5/6 = 20x = 20 - 5/6x = 19.2Therefore, the baristas secret formula beans cost per pound is $19.2.
Answer:
Find 5 rational numbers between 4/5 - and * 3/7
The perimeter of a rectangle is 32 3232 centimeters. The width is 7 centimeters
Hello!
Given,
Perimeter of rectangle = 32 cm
Width = 7cm
Perimeter of a rectangle = 2 (l+b)
32cm = 2l + 2 (7cm)
32 cm = 2l + 14cm
32cm -14cm =2l
2l= 18cm
l = 9cm
Area of a rectangle = length × breadth
= 7cm × 9cm
= 63 cm^2
According to a recent poll by YouGov. Com, in the United States 78% of 18 to 29-year-old Citizens think that college should be free for all students. Select a random sample of SO U. S. Citizens ages 18 to 29 and let X = The number of individuals in the sample who think that college should be free for all students. (A) Show that the probability distribution of X is aproximately normal. (B) Calculate the mean and standard deviation of the aproximate normal distribution
(C) Use this normal distribution to calculate the probability that 35 or fewer of the individuals in the sample think that college should be free for all students
(D) An independent study at Waynesburg University found that 35 of a random sample of 50 Students think that college should be free for all students. Based on this result and your answer to part C does the data provide convincing evidence that less than 78% of Waynesburg University students think that college should be free for all students
(A). The probability distribution of X is approximately normal because the sample size is large enough (n = 50) and the population proportion (p = 0.78) is not too close to 0 or 1.
(B) The mean of the approximately normal distribution is μ = np = 50 x 0.78 = 39, and the standard deviation is σ = sqrt(np(1-p)) = sqrt(50 x 0.78 x 0.22) = 3.22.
(C) To calculate the probability that 35 or fewer individuals need to standardize the value of X using the formula z = (X - μ) / σ. Then, z = (35 - 39) / 3.22 = -1.24 in the standard normal distribution table or using a calculator. The probability is approximately 0.1093 or 10.93%.
(D). The null hypothesis is H0: p = 0.78, and the alternative hypothesis is Ha: p < 0.78. The test statistic is z = (35/50 - 0.78) / sqrt(0.78 x 0.22 / 50) = -1.97, which has a p-value of 0.0244 or 2.44%.
Probability is a branch of mathematics that deals with the study of random events. It is the measure of the likelihood of an event occurring, expressed as a number between 0 and 1. An event with probability 0 means it will never occur, while an event with probability 1 means it will always occur.
The calculation of probability involves analyzing the possible outcomes of an event and assigning a probability to each outcome based on its likelihood of occurring. The probability of an event is determined by dividing the number of favorable outcomes by the total number of possible outcomes. Probability is used in various fields, such as statistics, finance, engineering, and science, to make predictions and informed decisions.
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a school pays 1,852 for 150 shirts . this includes the 25$ flat-rate shipping costs. c. what are the initial value and rate of change of the function? what does each on represent
Therefore, the initial value of the function is $1,852 and the rate of change is $12.18 per shirt. The initial value represents the cost of the shirts before any were purchased,
What is function?In mathematics, a function is a rule that assigns to each element in a set called the domain, a unique element in another set called the range. In other words, a function is a mathematical object that takes an input and produces a specific output, according to a specific set of rules or operations.
by the question.
et the initial value be represented by a and the rate of change by r.
The given information can be represented by the following equation:
a + 150r = 1,852
Since the flat-rate shipping cost is $25, the cost of the 150 shirts alone would be:
a + 150r - 25 = 1,827
The initial value, a, represents the cost of the shirts before any shirts were purchased. In this case, it would be the cost of the shirts if no shirts were purchased plus the flat-rate shipping cost of $25.
So, a = 1,827 + 25 = 1,852.
The rate of change, r, represents the increase in cost for each additional shirt purchased. In this case, it would be the cost of one shirt.
So, r = (1,852 - 25)/150 = 12.18.
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Find the circumference of both circles to the nearest hundredth. A green circle has a radius of 22 meters. A blue circle is inside the green circle. A point on the circumference of the blue circle is on the circumference of the green circle. The radius of the small blue circle is half the radius of the green circle. The circumference of the green circle is about
meters
Green Circle's circumference is 138.16 metres.
Blue Circle's circumference is 69.08 metres.
The green circle has a radius of 22 metres.
The blue circle's diameter is 1/2. the green circle's radius is 12*22, or 11 metres.
The formula for circumference is C = 2r.
The Green circle's circumference is 2*3.14*22, or 138.16 metres.
The Blue Circle's circumference is 2 * 3.14 * 11 = 69.08 metres.
What is its diameter?
The circumference of a circle or other curved geometric object refers to its length. It is the boundary across any two-dimensional circular surface measured linearly in one dimension.
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(x+2)^2=-16 This equation had no solution, why not?
Answer:
It has no solution within Real numbers. Its solutions are Complex/imaginary, since its discriminant is negative (-64).
Step-by-step explanation:
The normalized form of the equation
(x+2)^2= - 16
x^2 + 4x + 4 = - 16
x^2 + 4x + 20 = 0
We have in the form ax^2 + abx + c = 0
a = 1
b = 4
c = 20
Discriminant is b^2 - 4ac = 4^2 - 4*1*20 = 16 - 80 = - 64
Discriminant is negative, therefore, no Real solutions.
In △PQR
how many degrees is m∠Q?
Answer:
105 degrees
Step-by-step explanation:
sum of angles in triangle is 180 degrees
11x-5+6x+5+x = 180
simplify this to get 18x=180
180/18 = 10 = x
plug in 10 for x
11(10) - 5
110-5
105
a population numbers 20,000 organisms initially and grows by 17.1% each yearSuppose PP represents population, and tt the number of years of growth. An exponential model for the population can be written in the form P=a⋅bt whereP =
The exponential model for the population can be written as P = 20000 * 1.171^t, where P is the population after t years, 1.171 is the growth factor per year (100% + 17.1%), and 20000 is the initial population.
This equation assumes that the population grows continuously at a constant rate of 17.1% per year. It is an example of exponential growth, which means that the population increases at an increasingly faster rate over time.
Using this model, we can predict the population size at any point in the future. For example, after 5 years, the population would be P = 20000 * 1.171^5 = 41,992 organisms. It is important to note that this model is based on certain assumptions, such as unlimited resources and a constant growth rate, which may not always hold true in real-world scenarios.
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Which expression below gives the average rate of change of the function h(x) = 4x+2 +7 on the interval -3 ≤ x ≤ 5?
A. (43+2+7)-(45+2+7)
-3+5
B. (45*2 + 7)-(4+2+7)
5-3
C. (45+2+7)-(43+2+7)
5+3
D. (45+²+7)+(42+7)
5+3
Answer:
C. (45+2+7)-(43+2+7) / 5+3
Step-by-step explanation:
To find the average rate of change of h(x) on the interval -3 ≤ x ≤ 5, we need to evaluate the following expression:
[h(5) - h(-3)] / (5 - (-3))
We have:
h(5) = 4(5) + 2 + 7 = 29
h(-3) = 4(-3) + 2 + 7 = -5
Substituting into the formula, we get:
[29 - (-5)] / (5 - (-3)) = 34 / 8 = 17 / 4
Therefore, the expression that gives the average rate of change of the function h(x) on the interval -3 ≤ x ≤ 5 is:
C. (45+2+7)-(43+2+7) / 5+3
give three examples of contracts you are currently a part of or have been a part of in the past. identify whether they are unilateral or bilateral; express or implied; executed or executory.
The three examples of contracts are:
Employment ContractRental AgreementPurchase AgreementContracts are legal agreements between two or more parties that involve the exchange of goods, services, or money. They can be classified as unilateral or bilateral, express or implied, executed or executory.
Here are three examples of contracts that a person can be a part of:
Employment Contract: An employment contract is a bilateral, express contract between an employer and an employee. It defines the terms and conditions of employment, including salary, benefits, and job responsibilities. An employment contract is executed when both parties have agreed to the terms of the agreement and have signed the contract.Rental Agreement: A rental agreement is a unilateral or bilateral, express or implied, executory contract between a landlord and a tenant. It outlines the terms of the lease, such as the duration of the tenancy, rent, security deposit, and maintenance responsibilities. A rental agreement can be either oral or written. It is considered executed when the tenant moves in and starts paying rent.Purchase Agreement: A purchase agreement is a bilateral, express contract between a buyer and a seller. It outlines the terms of the sale, including the price, payment terms, delivery method, and warranty. A purchase agreement is executed when the buyer pays the agreed-upon amount and the seller delivers the product or service.To know more about the "contracts":https://brainly.com/question/5746834
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Zahid is paid a set wage of $774.72 for a 36-hour week, plus time-and-a-half for overtime. In one particular week, he worked 43 hours. What were Zahid’s earnings?
Samantha is paid a set wage of $962.50 for a 35-hour week, plus double time for overtime. In one particular week, she worked 40 hours. What were Samantha’searnings?
Therefore, Zahid earned $1,001.16 in that particular week in hour and Samantha earned $1,237.50 in that particular week.
What do you mean by hour?An hour is a unit of time measurement that represents a duration of 60 minutes or 3,600 seconds. It is commonly used to measure time in various contexts, such as work schedules, meetings, and appointments. The abbreviation for hour is "hr" or "h".
Given by the question.
For Zahid:
Regular wage per hour = $774.72 / 36 hours = $21.52/hour
Overtime wage per hour = 1.5 x $21.52 = $32.28/hour
Zahid worked 7 hours of overtime (43 - 36 = 7)
Zahid's earnings for the week would be:
Regular earnings = 36 hours x $21.52/hour = $775.20
Overtime earnings = 7 hours x $32.28/hour = $225.96
Total earnings = Regular earnings + Overtime earnings = $1,001.16
For Samantha:
Regular wage per hour = $962.50 / 35 hours = $27.50/hour
Overtime wage per hour = 2 x $27.50 = $55/hour
Samantha worked 5 hours of overtime (40 - 35 = 5)
Samantha's earnings for the week would be:
Regular earnings = 35 hours x $27.50/hour = $962.50
Overtime earnings = 5 hours x $55/hour = $275
Total earnings = Regular earnings + Overtime earnings = $1,237.50
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The equation y = -4/7x - 5 has a slope of
In the diagram below what is the measure in angel x
Answer:
143°
When solving angle problems, make sure to label the other angles (even the ones that are not asked) and use them to relate to each other to find the answer.
50 POINTS!!!!! NEED HELP ASAP!!!!! RUNNING OUT OF TIME!!!!!
Answer:17.6 cm
Step-by-step explanation:
if you can see the graph it can be seen as 17.6 cm.
Subtract 4 times the positive square root of z from thrice of x
The algebraic representation of the statement subtract 4 times the positive square root of z from thrice of x is 4√z - 3x.
What are coefficients?A mathematical expression is composed of term. A coefficient is an integer that is either multiplied by the variable it is associated with or put alongside the variable. A coefficient is, in other words, the numerical component of a phrase that contains both constants and variables. For instance, the coefficient in the expression 2x is 2.
The algebraic representation of the given statement is:
4 times the positive square root of z: 4√z
4 times the positive square root of z: 4√z - 3x
Hence, the algebraic representation of the statement subtract 4 times the positive square root of z from thrice of x is 4√z - 3x.
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Find the points on the ellipse that are farthest away from the point (1,0). (Round your answers to the nearest hundredth.) 4x^2 + y^2 = 4
(____ , ____) (largery-value )
(____ , ____) ( smaller y-value )
The required points are (0,2) and (0,-2) respectively.
The equation of the ellipse is 4x² + y² = 4. Find the points on the ellipse that are farthest away from the point (1,0). (Round your answers to the nearest hundredth.)Solution:The given equation of the ellipse is 4x² + y² = 4.Let (x, y) be a point on the ellipse.The square of the distance between (x, y) and (1,0) is given by:(x - 1)² + y²The maximum and minimum of (x - 1)² + y² occur at the same point where the maximum and minimum of [(x - 1)² + y²] is equal to the maximum and minimum of [4x² + y² - 4] and also where the gradient of both functions is perpendicular.Thus, we need to find the maximum and minimum of the function f(x, y) = (x - 1)² + y² subject to the constraint 4x² + y² = 4.Maximize and minimize the function f(x, y) subject to the constraint 4x² + y² = 4 using Lagrange multipliers.Let g(x, y) = 4x² + y² - 4 = 0 be the constraint equation.Let L be the Lagrange functionL(x, y, λ) = f(x, y) + λg(x, y)Therefore, L(x, y, λ) = (x - 1)² + y² + λ[4x² + y² - 4]Now differentiate L(x, y, λ) partially with respect to x, y and λ.Lx = 2(x - 1) + 8λxLy = 2y + 2λydL/dλ = 4x² + y² - 4 = 0From the equation dL/dλ = 0, we get4x² + y² = 4 ⇒ x²/1 + y²/4 = 1Thus, the ellipse can be represented as:x = cosθ; y = 2sinθwhere 0 ≤ θ ≤ 2πThus, Lx = 2(x - 1) + 8λx = 0⇒ 2cosθ - 2 + 8λcosθ = 0Ly = 2y + 2λy = 0⇒ 2sinθ + 2λ(2sinθ) = 0dL/dλ = 4x² + y² - 4 = 0⇒ 4cos²θ + 4sin²θ - 4 = 0⇒ cos²θ + sin²θ = 1∴ 4λsinθ + cosθ - 1 = 0Solving the equations obtained above, we get(1) θ = 0: (x, y) = (1,0)(2) θ = π: (x, y) = (-1,0)(3) θ = π/2: (x, y) = (0,2)(4) θ = 3π/2: (x, y) = (0,-2)The points on the ellipse that are farthest away from the point (1,0) are (0,2) and (0,-2).(0,2) has the largest y-value, and (0,-2) has the smallest y-value.Therefore, the required points on the ellipse are:(0, 2) (larger y-value)(0, -2) (smaller y-value)Hence, the required points are (0,2) and (0,-2) respectively.
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What are the solutions to the following system of equations?
x − y = 6
y = x^2 −6
A) (0, −6) and (7, 1)
B) (0, −6) and (1, −5)
C) (0, −6) and (9, 3)
D) (0, −6) and (−9, 3)
Answer:
B
Step-by-step explanation:
1. Notice all the LHS answers are (0,-6) so that's definitely an answer
2. Substitute out the y so 2nd equation becomes x-6=x^2-6; so x^2-x=0; therefore x=0 or x=1
3. x=1 so y=-5 and that's the second answer hence B
Answer:
The answer is B.
Step-by-step explanation:
hope this helps
Morgan sampled 101 students and calculated an average of 6.5 hours of sleep each night with a standard deviation of 2.14. Using a 90% confidence level, she also found that t* = 1.660.A 90% confidence interval calculates that the average number of hours of sleep for working college students is between __________ hours. Answer choices are rounded to the hundredths place.a.)6.15 and 6.85b.)6.46 and 6.54c.)6.46 and 6.85d.)6.08 and 6.92
The 90% confidence interval for the average number of hours of sleep for working college students is between 6.15 and 6.85 hours.
Therefore, the answer is option (a) 6.15 and 6.85 hours.
What is confidence interval?A confidence interval is a statistical range of values within which we can be reasonably confident that the true value of a population parameter lies. It is commonly used in inferential statistics to estimate an unknown population parameter, such as a mean or a proportion, based on a sample from that population.
To calculate the 90% confidence interval for the average number of hours of sleep for working college students, we'll use the formula:
Confidence Interval = Sample Mean ± (Critical Value x Standard Error)
Where:
Sample Mean: 6.5 hours (the average number of hours of sleep)
Critical Value: t-value corresponding to a 90% confidence level with 100 degrees of freedom (101 students - 1)
Standard Error: Standard Deviation / Square Root of Sample Size
Let's plug in the values and calculate the confidence interval:
Standard Error = 2.14 / √101 ≈ 0.2139
Confidence Interval = 6.5 ± (1.660 x 0.2139)
Confidence Interval = 6.5 ± 0.3546
Lower Bound = 6.5 - 0.3546 ≈ 6.1454
Upper Bound = 6.5 + 0.3546 ≈ 6.8546
Rounding to the hundredths place, the 90% confidence interval for the average number of hours of sleep for working college students is between 6.15 and 6.85 hours.
Therefore, the answer is option (a) 6.15 and 6.85 hours.
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5.6 Enrichment and Extension
Please answer A, B, D, F, H, l, N, and P
Step-by-step explanation:
a. f(x) = s(q(x))
b. f(x) = q(s(q(x)))
d. f(x) = g(p(h(x)))
f. f(x) = q(s(x))
i. f(x) = h(r(x))
n. f(x) = h(g(s(x)))
not sure about h and p tho
hope this helps
Sean pays £10 for 24 chocolate bars.
He sells all 24 chocolate bars for 50p each.
Work out Sean's percentage profit
so he got them for £10 all 24 bars, then he went and sold each for 50c, so hmmm 24 at £0.50 that's (24)(0.5) = 12, so he bought them for £10 and sold them for £12, he's got a surplus or profit of £2.
now, if we take 10(origin amount) as the 100%, what's 2 off of it in percentage?
[tex]\begin{array}{ccll} amount&\%\\ \cline{1-2} 10 & 100\\ 2& x \end{array} \implies \cfrac{10}{2}~~=~~\cfrac{100}{x} \\\\\\ 5 ~~=~~ \cfrac{ 100 }{ x }\implies x=\cfrac{100}{5}\implies x=20[/tex]
Find the area of the triangle.
Answer: 5 units^2
Step-by-step explanation:
You can deduce that the height of the triangle is 5. You use the pythagoreon theorem to find the missing distance. 5^2+x^2=7^2
X=sqrt24.
Using that info you find the area of the missing triangle. Getting 2.5sqrt24. Find the area of the combined triangles, (5*(2+sqrt25))/2.
you should get 5+2.5sqrt24. Then subtract the missing triangle to get 5.
show that v is an eigenvector of A and find the corresponding eigenvalue, λ.A= [\begin{ccc}-1&1\\6&0\end{array}\right], v = [\begin{ccc}1\\3\end{array}\right]λ=_____
The matrix A does not eigenvector v corresponding to the given eigen value.
λ.A = [ -11 60 ]
v = [ 1 3λ ]
v is an eigenvector of A calculate corresponding eigenvalue,
A × v = λ × v
where A is the given matrix.
v is the given vector.
λ is the corresponding eigenvalue.
× denotes matrix multiplication.
Let's first calculate A × v we have,
A × v
= [-11 60] × [ 1 3λ]
= [-11-33λ 60+ 180λ]
Check A× v is equal to λ × v ,
λ × v =
λ × [ 1 3λ]
= [λ 3λ^2]
Set these two vectors equal to each other and get the following system of equations ,
-11-33λ = λ __(1)
60+ 180λ = 3λ^2 ___(2)
From equation (1) we get,
⇒34λ = -11
⇒ λ = -11/34
Substituting this value of λ into the second equation, we have,
60+ 180λ = 3λ^2
⇒ 60 + 180(-11/34) = 3(-11/34)^2
⇒ (2040 -1980)/ 34 = 3(-11/34)^2
⇒ 60/34 = 3( 11/34)^2
⇒ 60 × 34 = 3 × 11 × 11
⇒20× 34 = 11 × 11
Which is not true.
so the value of λ does not satisfies both equations.
Therefore, v is not an eigenvector of A with corresponding eigenvalue λ.
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The above question is incomplete, the complete question is:
Check whether v is an eigen vector of A if yes find the corresponding eigen value.
λ.A = [ -11 60 ]
v = [ 1 3λ ]
ANSWER ASAP
Find the length of the hypotenuse in a right triangle with the following two side lengths.
a = 12, b = 16, c = ?
A. c = 17
B. c = 18
C. c = 19
D. c = 20
Answer: 20
Step-by-step explanation:
Using the Pythagorean theorem, we know that:
c² = a² + b²
Substituting the given values, we get:
c² = 12² + 16²
c² = 144 + 256
c² = 400
Taking the square root of both sides, we get:
c = √400
c = 20
Therefore, the length of the hypotenuse in the right triangle is 20.
An appliance dealer sells three different models of upright freezers having 13.4, 15.8, and 19.3 cubic feet of storage space. Consider the random variable x - the amount of storage space purchased by the next customer to buy a freezer. Suppose that x has the following probability distribution. x P(x) 13.4 0.2 15.8 0.5 19.3 0.3 (a) Calculate the mean and standard deviation of x (in cubic feet). (Hint: See Example 6.15. Round your standard deviation to four decimal places.) μx = _____ cubic ft
θx = _____ cubic ft
(a) μx 15.55 cubic feet. The standard deviation is the square root of the variance, i.e., θx = 1.881 cubic feet
The mean, or expected value, of x can be calculated as μx = Σ(xi * P(xi)) where xi are the possible values of x and P(xi) are their corresponding probabilities. Thus, μx = (13.40.2) + (15.80.5) + (19.3*0.3) = 15.55 cubic feet.
To calculate the standard deviation, we first need to calculate the variance, which can be obtained as θ²x = Σ((xi-μx)² * P(xi)). Thus, θ²x = ((13.4-15.55)²0.2) + ((15.8-15.55)²0.5) + ((19.3-15.55)²*0.3) = 3.54.
Therefore, the standard deviation is the square root of the variance, i.e., θx = √3.54 = 1.881 cubic feet (rounded to four decimal places).
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which degenerate conic is formed when a double cone is sliced at the apex by a plane perpendicular to the base of the cone?
When a double cone is sliced at the apex by a plane perpendicular to the base of the cone, the resulting conic section is a parabola.
Option B is the correct answer.
We have,
A parabola is a type of conic sect ion that can be defined as the locus of points equidistant from a fixed point (the focus) and a fixed line (the directrix).
In the case of slicing a double cone at the apex, the resulting conic section will have the characteristic shape of a parabola.
The slicing plane intersects both sides of the double cone, creating a curved shape that opens upward or downward, depending on the orientation of the cone.
The vertex of the parabola corresponds to the point of intersection of the slicing plane with the double cone.
Therefore,
When a double cone is sliced at the apex by a plane perpendicular to the base, a parabola is formed.
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The complete question:
Which degenerate conic is formed when a double cone is sliced at the apex by a plane perpendicular to the base of the cone?
A. Circle
B. Parabola
C. Ellipse
D. Hyperbola
Stanley left his home at 8:00 a. M. And went to Peter's house. For the first 48 minutes of his trip, his average driving speed was 50 km/h. (a) Find the distance travelled (in km) for the first 48 minutes of his trip. (b) For the remaining journey, Stanley drove at a speed of 90 km/h for 1 minutes. It is given that his average driving speed for the whole journey is 70 km/h. Hours if he -Example 73) (i) Express, in terms of 1, the distance travelled (in km) for the remaining journey. (ii) Did Stanley arrive at Peter's house before 9:30 a. M. ? Explain your answer
(a) Distance travelled in first 48 minutes = 40 km. (b)(i) Distance travelled in remaining journey = 30 km. (ii) Yes, Stanley arrived at Peter's house before 9:30 a.m. as he reached there at 9:28 a.m.
(a) To find the distance travelled for the first 48 minutes, we can use the formula:
distance = speed x time
The speed is 50 km/h and the time is 48/60 hours (since 48 minutes is 0.8 hours). So,
distance = 50 x 0.8
distance = 40 km
Therefore, Stanley travelled 40 km for the first 48 minutes of his trip.
(b) Let's use the formula for average speed:
average speed = total distance ÷ total time
We know that the total distance is the distance travelled in the first 48 minutes plus the distance travelled for the remaining journey. Let's call the distance for the remaining journey "d". We also know that the total time is 1 hour (60 minutes).
So,
70 = (40 + d) ÷ 1
40 + d = 70
d = 30
Therefore, the distance for the remaining journey is 30 km.
(i) To express the distance travelled for the remaining journey in terms of 1, we can use the formula we found in part (b):
d = 30 km
(ii) To find out if Stanley arrived at Peter's house before 9:30 a.m., we need to know the total time of his journey. We know that he left his home at 8:00 a.m. and his average speed was 70 km/h. So, the total distance he travelled is:
distance = speed x time
distance = 70 x time
We also know that the total distance is the distance for the first 48 minutes plus the distance for the remaining journey:
distance = 40 + 30
distance = 70 km
Therefore, the total time of his journey is:
time = distance ÷ speed
time = 70 ÷ 70
time = 1 hour
Since he arrived at Peter's house at 9:00 a.m. (1 hour after he left his home), we can conclude that he arrived before 9:30 a.m.
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