On the 7th day after the videο was pοsted, 640 peοple will see the videο.
What is Statistics?Statistics is the discipline that cοncerns the cοllectiοn, οrganizatiοn, analysis, interpretatiοn, and presentatiοn οf data.
1 Let's start by finding the pattern in the number οf viewers. We knοw that οn the first day, 5 peοple watched the videο. On the next day, the number οf viewers dοubled tο 5 x 2 = 10. On the third day, the number οf viewers dοubled again tο 10 x 2 = 20. We can see that the number οf viewers is dοubling each day, which means we can write the number οf viewers as:
[tex]V = 5 x 2^n[/tex]
where n is the number οf days after the videο was pοsted.
Nοw we want tο find οn which day the number οf viewers will be 640. Sο we can set V equal tο 640 and sοlve fοr n:
[tex]640 = 5 x 2^n[/tex]
[tex]2^n = 128[/tex]
n = lοg2(128) = 7
2. Tο find the first day when mοre than 20,000 peοple will see the videο, we can set V equal tο 20,000 and sοlve fοr n:
[tex]20,000 = 5 x 2^n[/tex]
2^n = 4,000
n = lοg2(4,000) ≈ 11.29
Since n represents the number οf days after the videο was pοsted, we can rοund up tο the next whοle number tο find the first day when mοre than 20,000 peοple will see the videο. Therefοre, οn the 12th day after the videο was pοsted, mοre than 20,000 peοple will see the videο if the trend cοntinues
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lighting, inc. uses direct labor hours as a basis for allocating overhead. next year's estimated total overhead is $180000 and direct labor hours are predicted to be $30000 hours. the average labor cost is $10 per. what is the predetermined overhead rate
Answer:
The predetermined overhead rate is calculated as follows:
Predetermined overhead rate = Estimated total overhead / Estimated total direct labor hours
In this case, the estimated total overhead is $180,000, and the estimated total direct labor hours are 30,000. Therefore:
Predetermined overhead rate = $180,000 / 30,000 hours
Predetermined overhead rate = $6 per direct labor hour
So, the predetermined overhead rate is $6 per direct labor hour.
What is the percent of change from 100 to 85?
Hi!
The percent change is 15%.
Hope this helps!
~~~PicklePoppers~~~
evaluate cos2a if sin3a=2sina
Using triple angle formula the evaluation of the trigonometric identity cos(2a) are 1 and 1/2.
What is the value of cos2aWe can use the trigonometric identity cos(2a) = 1 - 2sin^2(a) to evaluate cos(2a), but first we need to find the value of sin(a) from the given equation.
Given: sin(3a) = 2sin(a)
We can expand sin(3a) using the triple angle formula:
[tex]sin(3a) = 3sin(a) - 4sin^3(a)[/tex]
Substituting the given equation into this, we get:
[tex]2sin(a) = 3sin(a) - 4sin^3(a)[/tex]
Simplifying, we can rearrange to get:
[tex]4sin^3(a) - sin(a) = 0[/tex]
Factorizing, we get:
[tex]sin(a)(4sin^2(a) - 1) = 0[/tex]
So, either sin(a) = 0 or 4sin^2(a) - 1 = 0.
If sin(a) = 0, then
[tex]cos(a) = \±1\\cos(2a) = cos^2(a) = 1.[/tex]
If 4sin^2(a) - 1 = 0, then we can solve for sin(a) to get:
[tex]sin(a) = \±\sqrt{(1/4)} = \±1/2[/tex]
If sin(a) = 1/2, then
[tex]cos(a) = \sqrt{(1 - sin^2(a))} = \sqrt{(1 - 1/4)} = \sqrt{3/2}[/tex]
Using the identity cos(2a) = 1 - 2sin^2(a), we can then calculate:
[tex]cos(2a) = 1 - 2sin^2(a) = 1 - 2(1/4) = 1/2[/tex]
If sin(a) = -1/2, then cos(a) = -√3/2, and using the same identity we get:
[tex]cos(2a) = 1 - 2sin^2(a) = 1 - 2(1/4) = 1/2[/tex]
So, we have two possible values for cos(2a): 1 and 1/2.
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What is the smallest possible integer for which 18% of that integer is greater than 3.5 ?
A14
B 16
C 18
D 20
E 22
Answer:
D 20
Step-by-step explanation:
Let's call the integer we're looking for "x". We know that 18% of x is greater than 3.5, so we can write the inequality:
0.18x > 3.5
To solve for x, we can divide both sides by 0.18:
x > 3.5 ÷ 0.18
x > 19.44
We want the smallest possible integer that satisfies this inequality, which is 20. So the answer is D) 20.
With median as the base calculate mean deviation and compare the variability of two series a and b.
Series a: 3487,4572,4124,3682,5624,4388,3680,4308
Series b:487,508,620,382,408,266,186,218
Answer:
Step-by-step explanation:
First, we need to find the median of each series.
For series a, the median is:
(3680 + 3682)/2 = 3681
For series b, the median is:
(382 + 408)/2 = 395
Next, we calculate the deviation of each value from its respective median:
For series a:
|3487 - 3681| = 194
|4572 - 3681| = 891
|4124 - 3681| = 443
|3682 - 3681| = 1
|5624 - 3681| = 1943
|4388 - 3681| = 707
|3680 - 3681| = 1
|4308 - 3681| = 627
For series b:
|487 - 395| = 92
|508 - 395| = 113
|620 - 395| = 225
|382 - 395| = 13
|408 - 395| = 13
|266 - 395| = 129
|186 - 395| = 209
|218 - 395| = 177
Then, we calculate the mean deviation for each series by adding up the absolute deviations and dividing by the number of values:
For series a:
Mean deviation = (194 + 891 + 443 + 1 + 1943 + 707 + 1 + 627)/8
= 682.5
For series b:
Mean deviation = (92 + 113 + 225 + 13 + 13 + 129 + 209 + 177)/8
= 115.5
Comparing the two mean deviations, we see that series a has a larger mean deviation than series b. This indicates that series a has more variability than series b.
consider the graph it f(x) = (1/2)^x
each graph shows the result of a transformation applied to function f
complete this statement given that g(x) = -f(x)
The graph of function g is graph _W,X,Y,Z_ because the graph of function g is the result of a ____vertical compression, vertical stretch, horizontal shift, reflection over the x axis____ applied to the graph of function f.
Answer:
graph Z , Horizontal Shift
Step-by-step explanation:
Got it right on edmentum.
the central limit theorem states that the distribution of the sample mean will be approximately normal if _____
The central limit theorem states that the distribution of the sample mean will be approximately normal if the sample size is sufficiently large.
Specifically, the central limit theorem states that if the sample size (n) is greater than or equal to 30, then the sample mean (X) will be approximately normally distributed with a mean equal to the population mean (μ) and a standard deviation equal to the population standard deviation (σ) divided by the square root of the sample size (n). Mathematically X~N(μ, σ/√n)
For example, if a population has a mean of 10 and a standard deviation of 2, then a sample of size 30 taken from that population will have a sample mean (X) that is approximately normally distributed with a mean of 10 and a standard deviation of 2/√30, or 0.6.
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a function ___ specifies the return data type, name of the function, and the parameter variable(s).
A function declaration specifies the return data type, name of the function, and the parameter variable(s).
In programming, a function declaration is a statement that specifies the characteristics of a function. It includes the name of the function, the return data type (if any), and the parameter variable(s) (if any) that the function expects to receive as input. The declaration is used to inform the compiler or interpreter about the existence and behavior of the function, so that it can be called from other parts of the program. The function's actual implementation or definition is typically written separately from the declaration. By separating the declaration and implementation of a function, programs can be more modular and easier to maintain.
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C is 2 units closer to B than it is to A, if A = 5, B=15
Answer:
the coordinate of C is 10.5, and the distance between A and C is 10.5 - 5 = 5.5, and the distance between B and C is 15 - 10.5 = 4.5.
Step-by-step explanation:
If C is 2 units closer to B than it is to A, then we can find the distance between A and C and between B and C by using the distance formula:
Distance between two points (x1, y1) and (x2, y2) = sqrt[(x2 - x1)^2 + (y2 - y1)^2]
Let x be the coordinate of C. Then, the distance between A and C is x - 5, and the distance between B and C is 15 - x. We know that the distance between B and C is 2 units greater than the distance between A and C, so we can set up an equation:
15 - x = 2 + (x - 5)
Simplifying and solving for x, we get:
15 - x = 2 + x - 5
18 - x = x - 3
2x = 21
x = 10.5
Therefore, the coordinate of C is 10.5, and the distance between A and C is 10.5 - 5 = 5.5, and the distance between B and C is 15 - 10.5 = 4.5.
$690 is invested in an account earning 2.2% interest (APR), compounded quarterly.
Write a function showing the value of the account after t years, where the annual growth rate can be found from a constant in the function. Round all coefficients in the function to four decimal places. Also, determine the percentage of growth per year (APY), to the nearest hundredth of a percent.
Step-by-step explanation:
The formula to calculate the value of the account after t years, with principal P and annual percentage rate (APR) r compounded n times per year, is given by:
A = P(1 + r/n)^(nt)
In this case, P = $690, r = 0.022 (2.2% expressed as a decimal), n = 4 (compounded quarterly), and t is the number of years.
So the function to calculate the value of the account after t years is:
A(t) = 690(1 + 0.022/4)^(4t)
Simplifying and rounding to four decimal places, we get:
A(t) = 690(1.0055)^4t
To find the annual percentage yield (APY), we use the formula:
APY = (1 + r/n)^n - 1
In this case, r = 0.022 and n = 4, so:
APY = (1 + 0.022/4)^4 - 1
= 0.022321
Multiplying by 100 and rounding to two decimal places, we get an APY of 2.23%.
If a ll b, find the value of x.
Answer:
x = 18
Step-by-step explanation:
Alternate exterior angles are congruent. Set the equations equal to each other and solve for x.
7x + 11 = 10x - 43 Subtract 7 x from both sides
7x - 7x + 11 = 10x - 7x - 43
11 = 3x - 43 Add 3 to both sides
11 + 43 = 3x -43 + 43
54 = 3x Divide both sides by 3
[tex]\frac{54}{3}[/tex] = [tex]\frac{3x}{3}[/tex]
18 = x
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8. What is the area of sector EFG? Express the answer
in terms of л.
10
E
128⁰
G
The area of a sector is a region bounded by two radii of a circle and an arc between is (320/9) π sq. units.
What is radius?Radius is a straight line segment that connects the center of a circle or sphere to any point on its circumference or surface, respectively. In other words, it is the distance from the center of the circle or sphere to any point on its edge or surface.
According to question:The given sector is EFG = 128°.
The area of a sector is a region bounded by two radii of a circle and an arc between them.
A = (θ/360) × πr²
Where:
A is the area of the sectorθ is the central angle of the sector in degreesr is the radius of the circleThe fraction (θ/360) represents the fraction of the entire circle that the sector occupies. Multiplying this fraction by the total area of the circle (πr²) gives the area of the sector.
Use the formula for the area of a sector with the central angle in degrees:
A = (n/360) × πr²
From the given figure, n = 128 and r = 10
A = (128/360) × π(10)²
= (320/9) π sq. units.
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Which of the following is NOT a procedure for determining whether it is reasonable to assume that sample data are from a normally distributed population? Choose the correct answer below /08/19 1:59pm 3/15/19 1:59pm O A. Identifying outliers O B. Checking that the probability of an event is 0.05 or less OC. Visual inspection of a histogram to see if it is roughly bell-shaped OD. Constructing a graph called a normal quantile plot 1/29/19 1:59pm
Therefore , the solution of the given problem of probability comes out to be (B) Verifying that an event's chance is 0.05 or less is the right response.
What is probability exactly?The primary goal of a procedure's criteria-based methods is to calculate the probability that a statement is true or that a specific occurrence will occur. Any number range from 0 to 1, where 0 usually represents the likelihood of something happening and 1 typically represents an amount of confidence, can be used to represent chance. A probability illustration displays the possibility that a specific event will take place.
Here,
Several techniques can be used to determine whether it is reasonable to infer that sample data come from a population with a normally distributed population, including:
A. Recognizing anomalies
B. Verifying that an event's probability is 0.05 or lower C.
Examining a histogram visually to see if it approximately resembles a bell shape
D. Creating a normal quantile plot, a type of graph.
Option B is invalid because it doesn't reveal anything about how the sample data are distributed.
The threshold for statistical significance is the chance of an event being 0.05 or less, but it has no bearing on the distribution's shape.
As a result, (B) Verifying that an event's chance is 0.05 or less is the right response.
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there are 24total customers seated at 4 tables in a restaurant each table is the same size and has the same number of customers tell whether each statement is truth or false
What is the meaning of "The elements of F are all finite sequences (x1, x2, ..., xn) of elements of X "?
This is true, of course. The collection of any and all finite sequence of X's elements, along with the concatenation operation, is referred to as the free fuzzy set F over a set .
What does the math symbol X mean?The sentence xA denotes that x is an element of a set A since the symbol denotes set membership and meaning "is an element of". In those other words, x belongs to the group of (potentially many) items in set A.
What do math components consist of?
Components are also the components that constitute a set. A shared characteristic of the items can define a set. For instance, the set is the collection E of positive roughly equal numbers. Furthermore, F is a semigroup, since the operation of concatenation is associative: if and are elements of F, then Finally, F is a free semigroup over , which means that every element of F can be written uniquely as a product of elements of .
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Xochitl spots an airplane on radar that is currently approaching in a straight line, and that will fly directly overhead. The plane maintains a constant altitude of 7425 feet. Xochitl initially measures an angle of elevation of 19 degrees to the plane at point A.
At some later time, she measures an angle of elevation of 37 degrees to the plane at point B. Find the distance the plane traveled from point A to point B. Round your answer to the nearest foot if necessary.
The plane travels a distance of 11710 feet from point A to point B.
Why are trig ratios important?
As specified by the definition of a right-angled triangle's side ratio, trigonometric ratios are the values of all trigonometric functions. The trigonometric ratios of any acute angle in a right-angled triangle are the ratios of its sides to that angle.
The figure representing the situation is given below.
From triangle AOC,
tan 19° = AC / OC
tan 19° = 7425 / OC
OC = 7425 / tan 19°
OC = 21563.77 feet
Similarly for triangle BOD,
tan 37° = BD / OD
tan 37° = 7425 / OD
OD = 7425 / tan 37°
= 9853.31 feet
AB = CD
= OC - OD
= 21563.77 feet - 9853.31 feet
= 11,710.46 feet
≈ 11710 feet
Hence the distance plane travelled from point A to point B is 11710 feet.
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The name of a U.S. state is spelled out with letter tiles. Then the tiles are placed in a bag, and one is picked at random. What state is spelled out if the probability of picking the letter O is 1/2? , 3/8?, 1/3?. (need 3 answers with explanations)
Answer:
Ohio
Colorado
Oregon
Step-by-step explanation:
1/2 of the letters in Ohio are O)
3/8 letters in Colorado are O)
2/6 letters in Oregon are the letter O which Is 1/3
HERE IS THE SEQUENCE OF NUMBERS 3,6,11,18,27...
FIND THE NTH TERM OF THE SEQUENCE
3, 6, 11, 18, 27, 38, 51 , Next term 51 in the sequence is nth term .
What does math sequence mean?
An arrangement of numbers in a specific order is referred to as a sequence. The sum of the components of a sequence, on the other hand, is what is referred to as a series.
SEQUENCE 3,6,11,18,27...
the series follows the odd counting.
for example:
we have odd numbers: 1, 3, 5, 7, 9, 11, 13, 15, etc.
now
3 + 3 = 6
6 + 5 = 11
we can see adding odd numbers in a series results in the solution of the proceeding number of series.
similarly,
11 + 7 = 18
18 + 9 = 27
27 + 11 = 38
now adding 13 to 38 according to the series will result in the next number.
38 + 13 = 51
hence, 51 is the next number in the series.
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P, Q, R, S, T and U are different digits.
PQR + STU = 407
Step-by-step explanation:
There are many possible solutions to this problem, but one possible set of values for P, Q, R, S, T, and U is:
P = 2
Q = 5
R = 1
S = 8
T = 9
U = 9
With these values, we have:
PQR = 251
STU = 156
And the sum of PQR and STU is indeed 407.
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In a triangle, the interior angles add up to 180º.
True
False
Answer:
it should be true because sum of 3 interior angle of a triangle is 180 degree
Answer:
True.
Step-by-step explanation:
A triangle's angles add up to 180 degrees because one exterior angle is equal to the sum of the other two angles in the triangle. In other words, the other two angles in the triangle (the ones that add up to form the exterior angle) must combine with the third angle to make a 180 angle.
32 Select the correct answer from each drop-down menu. Let c(g) be the total cost, including shoe rental, for bowling g games at Pin Town Lanes. c (g) 5g + 3 So, c(6) = __(14,30,8,33)__ This means that__(6games,total cost of 6,6 per game)__ the __(number of games is 14, total cost is 30, total cost is 33,games are 8 each__
correct answer is
c(6) = 33This means that the total cost of 6 games (including shoe rental) is $33.Explain equationA mathematical statement that demonstrates the equivalence of two expressions is known as an equation. It has two sides that are divided by an equal symbol. Each side of the equation can contain variables, constants, and mathematical operations such as addition, subtraction, multiplication, division, exponentiation, and logarithms.
c(6) = 5(6) + 3 = 30 + 3 = 33
This means that the total cost of 6 games (including shoe rental) at Pin Town Lanes is $33.
Therefore, the correct answer is:
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What rotation centered about the origin maps (4, − 7) to (7,4) ? 90° counterclockwise 180° counterclockwise 270° counterclockwise I don't know. ←
Answer:
What rotation centered about the origin maps (4, − 7) to (7,4) ? 90° counterclockwise 180° counterclockwise 270° counterclockwise I don't know. ←
Step-by-step explanation:
To map the point (4, -7) to (7, 4) by a rotation centered about the origin, we need to find the angle of rotation and direction.
We can start by finding the vector from the origin to (4, -7), which is <4, -7>. We want to rotate this vector to the vector from the origin to (7, 4), which is <7, 4>.
To do this, we need to find the angle between these two vectors. Using the dot product, we have:
<4, -7> · <7, 4> = (4)(7) + (-7)(4) = 0
Since the dot product is zero, we know that the two vectors are orthogonal, and the angle between them is 90 degrees.
To map (4, -7) to (7, 4) with a 90-degree rotation counterclockwise, we can use the matrix:
[0 -1]
[1 0]
Multiplying this matrix by the vector <4, -7>, we get:
[0 -1] [4] = [-7]
[1 0] [-7] [ 4]
which corresponds to the point (-7, 4). This matches our desired endpoint, so the answer is 90° counterclockwise.
Answer:
90° counterclockwise
Step-by-step explanation:
I am not sure if the picture helps or not. I am trying to show that I traced the point (4,-7). Then I have a plus sign at (0,0). I start rotating the tracing paper counterclockwise until I get to the point (7,4). I needed to turn one turn of the plus sign. That would be 90°
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Find the area of a triangle with base 1 2/3 inches and height 5 inches?
Answer:
The area of the triangle is 9.8 inches.
A manufacturer knows that their items have a normally distributed lifespan, with a mean of 5 years, and standard deviation of 1.3 years.
If you randomly purchase one item, what is the probability it will last longer than 6 years?
Answer:
Step-by-step explanation:
Let X be the lifespan of an item. We are given that X is normally distributed with a mean of μ = 5 years and a standard deviation of σ = 1.3 years.
We want to find the probability that an item will last longer than 6 years. Let Y be the random variable that represents the lifespan of an item in excess of 6 years, i.e. Y = X - 6. Then we want to find:
P(Y > 0)
Using the properties of normal distribution, we can standardize Y to get a standard normal variable Z:
Z = (Y - μ) / σ = (X - 6 - 5) / 1.3 = (X - 11) / 1.3
So we want to find:
P(Z > (6 - 11) / 1.3) = P(Z > -3.85)
Using a standard normal distribution table or calculator, we can find that the probability of Z being greater than -3.85 is very close to 1 (in fact, it is essentially 1). Therefore, the probability of an item lasting longer than 6 years is essentially the same as the probability of Y being greater than 0, which is 1.
Therefore, the probability that a randomly purchased item will last longer than 6 years is approximately 1.
Write an equation of the line satisfying the given conditions. Write the answer inslope-intercept form.
The line is perpendicular to the line defined by y = 4x-8 and passes through the point(8,3).
Answer:
[tex]y=-\frac{1}{4}x+5[/tex]
Step-by-step explanation:
Given the point (8,3) and slope of 4, we can write an equation in point-slope form.
We know that any line perpendicular to another line has a opposite reciprocal. The opposite reciprocal of 4 is [tex]-\frac{1}{4}[/tex].
Now, to write this in point slope form.
Point slope formula:
[tex]y-y_1=m(x-x_1)[/tex]
New equation:
[tex]y-3=-\frac{1}{4}(x-8)[/tex]
Simplify:
[tex]y=-\frac{1}{4}x+5[/tex]
Here is the equation :)
is 2/1 more than 1?
Answer: yes 2/1 is more than one
Step-by-step explanation: 2/1 is equivalent to 2 while 1 is just 1
Answer:
No! 2/1 is less then 1 because when devided, your answer will be -2 which is less then 1.
HELP ASAP PLEASE! What is the arc length of an arc with radius 18 inches and central angle 22°? Leave the answer in terms of n. Show your work.
Answer:
arc length = 2.2π inches
Step-by-step explanation:
arc length is calculated as
length = circumference of circle × fraction of circle
= 2πr × [tex]\frac{22}{360}[/tex] ( r is the radius )
= 2π × 18 × [tex]\frac{22}{360}[/tex] ( cancel 18 and 360 by 18 )
= 2π × [tex]\frac{22}{20}[/tex]
= [tex]\frac{44}{20}[/tex] π
= 2.2π inches
Find the volume of the solid generated by revolving the region enclosed by the following curves: a. y=4-2x², y = 0, x = 0, y = 2 through 360° about the y-axis. b. x = √y+9, x = 0, y =1 through 360° about the y-axis.
The volume of the solid generated by revolving the region enclosed by the curves y = 4 - 2x², y = 0, x = 0, and y = 2 through 360° about the y-axis is (16/3)π cubic units.
How to find the volume?To find the volume of the solid generated by revolving the region enclosed by the curves y = 4 - 2x², y = 0, x = 0, and y = 2 through 360° about the y-axis, we use the formula:
V = ∫[a,b] πr²dy
where a and b are the limits of integration in the y-direction, r is the radius of the circular cross-sections perpendicular to the y-axis, and V is the volume of the solid.
First, we need to find the equation of the curve that is generated when we rotate y = 4 - 2x² around the y-axis. To do this, we use the formula for the equation of a curve generated by revolving y = f(x) around the y-axis, which is:
x² + y² = r²
where r is the distance from the y-axis to the curve at any point (x, y).
Substituting y = 4 - 2x² into this formula, we get:
x² + (4 - 2x²) = r²
Simplifying, we get:
r² = 4 - x²
Therefore, the radius of the circular cross-sections perpendicular to the y-axis is given by:
r = √(4 - x²)
Now, we can integrate πr²dy from y = 0 to y = 2:
V = ∫[0,2] π(√(4 - x²))²dy
V = ∫[0,2] π(4 - x²)dy
V = π∫[0,2] (4y - y²)dy
V = π(2y² - (1/3)y³)∣[0,2]
V = π(8 - (8/3))
V = (16/3)π
Therefore, the volume of the solid generated by revolving the region enclosed by the curves y = 4 - 2x², y = 0, x = 0, and y = 2 through 360° about the y-axis is (16/3)π cubic units.
b. To find the volume of the solid generated by revolving the region enclosed by the curves x = √y+9, x = 0, and y = 1 through 360° about the y-axis, we use the same formula as in part (a):
V = ∫[a,b] πr²dy
where a and b are the limits of integration in the y-direction, r is the radius of the circular cross-sections perpendicular to the y-axis, and V is the volume of the solid.
First, we need to solve the equation x = √y+9 for y in terms of x:
x = √y+9
x² = y + 9
y = x² - 9
Next, we need to find the equation of the curve that is generated when we rotate y = x² - 9 around the y-axis. Using the same formula as in part (a), we get:
r = x
Now, we can integrate πr²dy from y = 1 to y = 10 (since x = 0 when y = 1 and x = 3 when y = 10):
V = ∫[1,10] π(x²)²dy
V = π∫[1,10] x⁴dy
V = π(1/5)x⁵∣[0,3]
V = π(243/5)
Therefore, the volume of the solid generated by revolving the region.
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Which graph matches the function given:
The graph that matches the piecewise function, f(x) = √(x + 5), if x < -2, f(x) = |x + 1| if -2 ≤ x ≤ 2, and f(x) = (x - 2)² if x > 2 is the graph in the third option.
What is a piecewise function?A piecewise function is a function is a function that consists of two or more subfunctions each of which are applied, based on the specific interval of the input variable.
The intervals of the piecewise function are;
f(x) = √(x + 5) if x < -2
f(x) = |x + 1| -2 ≤ x ≤ 2
f(x) = (x - 2)² if x > 2
The graph of the piecewise function is a three piece graph which consists of the graph of f(x) = √(x + 5), for x values less than -2, f(x) = |x + 1|, for x-values in the interval -2 ≤ x ≤ 2 and the graph of f(x) = (x - 2)²
The <-2, symbol indicates the presence of an open circle in the graph of f(x) = √(x + 5) at x = -2
The interval -2 ≤ x ≤ 2 for the function f(x) = |x + 1| indicates that the graph of f(x) = |x + 1| in the interval -2 ≤ x ≤ 2, consists of closed circles at x = -2 and x = 2.
The interval, x > 2, for the function, f(x) = (x - 2)², indicates that the presence of an open circle in the graph of f(x) = (x - 2)² at x = 2.
The correct option for the graph of the piecewise function is therefore the third option.
Please find the attached the graph of the piecewise function created with MS Excel
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You determine the percent abundance of
each length of nail and record it in the data
table below.
Sample
Type
Short nail
Medium nail
Long nail
Number Abundance
of Nails
(%)
67
18
10
70.5
19.0
10.5
Nail Length
(cm)
2.5
5.0
7.5
What is the weighted average length, in cm,
of a nail from the carpenter's box?
The weighted average length of a nail from the carpenter's box is 3.5 centimeters.
How to calculate the weighted average length?Different from calculating the average, the weighted average implies considering the frequency or abundance percentage. Now, to calculate the average weighted we will need to multiply the length of each type of nail by the abundance and finally, we will need to add the results obtained. The process is shown below:
Short nail: 2.5 cm x 70.5%= 1.7625 cm
Medium nail: 5.0 cm x (19% = 0.95 cm
Long nail: 7.5 cm x 10.5% = 0.7875 cm
1.7625 cm + 0.95 cm + 0.7875 cm = 3.5 cm
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