To solve the inequality -1/4a > 3a, we need to first multiply both sides by -4 to get rid of the fraction:
-1a > 12a
Next, we can subtract 12a from both sides to get:
-13a > 0
Dividing both sides by -13 gives us:
a < 0
To solve the inequality b – 12 > -3, we can add 12 to both sides:
b > 9
Now we need to find values of a and b that satisfy both inequalities. Since a < 0, we can try any negative value of a. Let's try a = -1:
-1/4(-1) > 3(-1)
1/4 > -3
This inequality is true, so we can move on to the next inequality. Let's plug in a = -1 and see if it satisfies b > 9:
b – 12 > -3
b > 9
Since -1 satisfies both inequalities, the values that make both inequalities true are: a = -1 and any value of b greater than 9.
Please upload a picture of a piece of paper with the problem worked out, and draw the graph for extra points, there will be 6 of these, so go to my profile and find the rest, and do the same, for extra points. for this one, use substitution method.
The value of X and y when substitution method is used to solve the given quadratic equation would be = 8 and 2 respectively.
How to calculate the unknown values using the substitution method?The equations that are given is listed below:
X - 3y = 2 ---> equation 1
2x - 6y = 6 ----> equation 2
In equation 1, make X the subject of formula;
X = 2 + 3y
Substitute X = 2 + 3y into equation 2,
2( 2 + 3y) - 6y = 6
4 + 6y - 6y = 6
y = 6-4
y = 2
Substitute y = 2 into equation 1;
x - 3(2) = 2
X = 2 + 6
X= 8
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Find the critical mumbers for g(x) = 2 sin r- r on (0,7). Then find the absolute maximum and minimum values for g(x) on (0,7). Give exact answers, not decimal approximations."
2 cos x - 1 = 0, cos x = 1/2, and x = π/3 or 5π/3. These are the critical numbers of g(x) on (0,7). the absolute maximum value of g(x) on (0,7) is √3 - π/3 and the absolute minimum value is -√3 - 5π/3.
To find the critical numbers for g(x) = 2sin(r) - r on the interval (0, 7), follow these steps:
1. Find the derivative of g(x): g'(x) = 2cos(r) - 1
2. Set the derivative equal to zero: 2cos(r) - 1 = 0
3. Solve for r: r = cos^(-1)(1/2)
Now, find the absolute maximum and minimum values for g(x) on the interval (0, 7):
1. Evaluate g(x) at the critical numbers: g(cos^(-1)(1/2)) = 2sin(cos^(-1)(1/2)) - cos^(-1)(1/2)
2. Evaluate g(x) at the endpoints of the interval: g(0) = 2sin(0) - 0, g(7) = 2sin(7) - 7
3. Compare the values from steps 1 and 2 to find the maximum and minimum values.
The critical numbers for g(x) = 2sin(r) - r on the interval (0, 7) are r = cos^(-1)(1/2). The absolute maximum and minimum values for g(x) on the interval (0, 7) can be found by comparing g(cos^(-1)(1/2)), g(0), and g(7).
To find the critical numbers of g(x) = 2 sin x - x on (0,7), we first need to find its derivative:
g'(x) = 2 cos x - 1
Setting g'(x) = 0, we get:
2 cos x - 1 = 0
cos x = 1/2
x = π/3 or 5π/3
These are the critical numbers of g(x) on (0,7).
To find the absolute maximum and minimum values of g(x) on (0,7), we need to evaluate g(x) at the critical numbers and at the endpoints of the interval (0,7).
g(0) = 0
g(π/3) = 2 sin(π/3) - π/3 = √3 - π/3
g(5π/3) = 2 sin(5π/3) - 5π/3 = -√3 - 5π/3
g(7) = 2 sin(7) - 7
To determine the absolute maximum and minimum values, we compare these values:
The absolute maximum value is √3 - π/3, which occurs at x = π/3.
The absolute minimum value is -√3 - 5π/3, which occurs at x = 5π/3.
Therefore, the absolute maximum value of g(x) on (0,7) is √3 - π/3 and the absolute minimum value is -√3 - 5π/3.
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Which geometric term would you use to describe the crossing sign shown below?
An X- shaped rail road crossing sign is shown.
A.
perpendicular lines
B.
parallel lines
C.
intersecting lines
D.
points
The geometric term that can be used to describe the crossing sign shown is intersecting lines.
What are intersecting lines geometry?In geometry, intersecting lines are two lines that cross one another at a location known as the point of intersection. It is possible to use the point of intersection to solve issues concerning angles, segments, and geometric shapes because it is the sole point that both lines share.
Two pairs of opposite angles that are equal to one another are formed when two lines connect, giving rise to four angles.
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help pls i need help on ,ath i jave a g
Answer: B
Step-by-step explanation:
GEOMETRY URGENT HELP: SINE, COSINE TANGENT
please help me i have no idea what i am doing
in the given triangle, using SOH CAH TOA, the value of x is 16.48
Trigonometry: Calculating the value of xFrom the question, we are to determine the value of x in the given diagram
In the given diagram,
We are given a right triangle.
70° is the included angle
6 is the adjacent
and x is the opposite
Using SOH CAH TOA,
sin (angle) = Opposite / Hypotenuse
cos (angle) = Adjacent / Hypotenuse
tan (angle) = Opposite / Adjacent
Then, we can write that
tan (angle) = Opposite / Adjacent
Then,
tan (70°) = x/6
x = 6 × tan(70°)
x = 16.48
Hence, the value of x is 16.48
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In nop, the measure of zp=90°, the measure of zn=39, and pn = 72 feet. find the length of op to the nearest tenth of a foot?
The length of OP to the nearest tenth of a foot is approximately 41.5 feet
To find the length of OP, we can use the Pythagorean theorem since we have a right triangle.
OP^2 = PN^2 - ON^2
First, we need to find ON using the trigonometric ratio of tangent.
tan(39) = ON/PN
ON = PN * tan(39)
ON = 72 * tan(39)
ON ≈ 53.4 feet
Now we can plug in our values:
OP^2 = 72^2 - 53.4^2
OP^2 ≈ 1720.84
OP ≈ 41.5 feet (rounded to the nearest tenth of a foot)
Therefore, the length of OP to the nearest tenth of a foot is approximately 41.5 feet.
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Can someone help me with 15 16 17 18?
Answer:15)5760.1 6)78. 17)582.4 18)112
Step-by-step explanation:
Just explain how to do it with the answer please.
The measures of the angles JIK and JIL are 67 degrees and 157 degrees
Calculating the measures of the angles JIK and JIL?From the question, we have the following parameters that can be used in our computation:
Tangent at point IDiameter = IKThe measure of IJ = 46 degreesThe inscribed angle opposite to the same arc is half of the external angle
Using the above as a guide, we have the following:
JIK = 90 - 46/2
JIK = 67 degrees
Also, we have
JIL = 90 + JIK
So, we have
JIL = 90 + 67
JIL = 157 degrees
Hence, the measure of the angle JIL is 157 degrees
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In a survey of 85 people, every fifth person had a pierced ear. How many people had a pierced ear? A 0.5 × 85 B 85 × 15 C 5÷85 D 85-4/5 E 85 × 0.25
Answer:
B
Step-by-step explanation:
Every fifth people means one person from 5 people in total. So when we convert that into numbers, it becomes [tex]\frac{1}{5}[/tex].
And in total there are 85 people involved, so the answer is
[tex]85[/tex] × [tex]\frac{1}{5}[/tex]
Answer:
Step-by-step explanation:
correct asnswer b
b. use the overhead rate in (a) to determine the amount of total and per-unit overhead allocated to each of the three products, rounded to the nearest dollar.
The amount of total and per-unit overhead allocated to each of the three products using overhead rate is equal to,
Total Per Unit Factory Overhead , Cost Factory Overhead Cost
Flutes $530 $1,060,000
Clarinets $795 $1,192,500
Oboes $397.5 $695,625
Total $1,722.5 $2,948,125
Budgeted factory overhead cost = $2,948,125
The single plantwide overhead rate
= Dividing the budgeted factory overhead cost by the total budgeted direct labor hours.
For this,
Flutes= 2,000×2
= 4,000 hours
Clarinets= 1,500×3
= 4,500 hours
Oboes= 1,750×1.5
= 2,625 hours
Total direct labor hours = 11,125
Substitute the value we have,
⇒ Single plantwide overhead rate = $2,948,125 / (2,000 x 2.0 + 1,500 x 3.0 + 1,750 x 1.5)
= $2,948,125 / 11,125
= $265 per direct labor hour
To allocate overhead to each product
=Multiply the overhead rate by the budgeted direct labor hours per unit for each product.
Substitute the value we have,
Flutes,
$265 x 2.0 = $530 total overhead cost, $265 per unit
Clarinets,
$265 x 3.0 = $795 total overhead cost, $265 per unit
Oboes,
$265 x 1.5 = $397.5 total overhead cost, $265 per unit
And
Total factory overhead cost allocated = Estimated manufacturing overhead rate× Actual amount of allocation base
For,
Flutes
= 4,000× 265
= $1,060,000
Clarinets
= 4,500×265
= $1,192,500
Oboes
= 2,625×265
= $695,625
This implies,
The total and per-unit overhead allocated to each product, rounded to the nearest dollar is,
Total Per Unit Factory Overhead , Cost Factory Overhead Cost
Flutes $530 $1,060,000
Clarinets $795 $1,192,500
Oboes $397.5 $695,625
Total $1,722.5 $2,948,125
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The above question is incomplete, the complete question is:
Bach Instruments Inc. makes three musical instruments: flutes, clarinets, and oboes. The budgeted factory overhead cost is $2,948,125. Overhead is allocated to the three products on the basis of direct labor hours. The products have the following budgeted production volume and direct labor hours per unit:
Budgeted Production Volume Direct Labor Hours Per Unit
Flutes 2,000 units 2.0
Clarinets 1,500 3.0
Oboes 1,750 1.5
a. Determine the single plantwide overhead rate.
$ per direct labor hour
b. Use the overhead rate in (a) to determine the amount of total and per-unit overhead allocated to each of the three products, rounded to the nearest dollar.
Total Per Unit
Factory Overhead Cost Factory Overhead Cost
Flutes $ $
Clarinets
Oboes
Total $
PLEASE HELPPPP!! 20pts Students in the Drama Club are purchasing accessories for a play. They shop at two different stores over the span of three days. The items purchased at Store A al cost the same amount. The tems pur
⢠Day 1: Students spent $30. They purchased 4 items from Store A and 7 items from Store B.
⢠Day 2: Students spent $22. They purchased 3 items from Store A and 5 items from Store B.
On Day 3 students will need to buy 10 items from Store A and 17 items from Store B. What is the amount of money the students will need on the third day?
Part A: Write a system of equations to model the situations
The students will need $74 on the third day.
Let x be the cost of one item at Store A and y be the cost of one item at Store B. Then the system of equations to model the situation is:
4x + 7y = 30
3x + 5y = 22
To find the cost on Day 3, we need to solve for x and y, and then use those values to calculate:
10x + 17y = ?
Part B: Solve the system of equations to find x and y
To solve the system of equations, we can use elimination or substitution. Here, we'll use substitution.
From the first equation, we can solve for x:
4x + 7y = 30
4x = 30 - 7y
x = (30 - 7y)/4
Substitute this expression for x into the second equation:
3x + 5y = 22
3((30 - 7y)/4) + 5y = 22
(90 - 21y)/4 + 5y = 22
90 - 21y + 20y = 88
-y = -2
y = 2
Now that we know y = 2, we can substitute this value back into either equation to find x:
4x + 7y = 30
4x + 7(2) = 30
4x + 14 = 30
4x = 16
x = 4
So x = 4 and y = 2.
Part C: Calculate the amount of money needed on Day 3
Finally, we can use these values to calculate the amount of money needed on Day 3:
10x + 17y = 10(4) + 17(2) = 40 + 34 = 74
Therefore, the students will need $74 on the third day.
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Find the Lap lace transform of
f(t) = 6u (t- 2) + 3u(t-5) - 4u(t-6)
F(s)=
To find the Laplace transform of f(t), we use the formula:
L{f(t)} = ∫[0,∞) [tex]e^(-st)[/tex] f(t) dt
where L{f(t)} denotes the Laplace transform of f(t) and u(t) is the unit step function.
Using the linearity of the Laplace transform, we can find the Laplace transform of each term separately and add them up.
L{6u(t-2)} = [tex]6e^(-2s)[/tex] / s (applying the time-shift property)
L{3u(t-5)} = [tex]3e^(-5s)[/tex] / s (applying the time-shift property)
L{-4u(t-6)} = -[tex]4e^(-6s[/tex]) / s (applying the time-shift property)
Therefore, the Laplace transform of f(t) is:
F(s) = L{f(t)} = 6[tex]e^(-2s)[/tex] / s + [tex]3e^(-5s)[/tex] / s - [tex]4e^(-6s)[/tex]/ s
= [tex](6e^(-2s) + 3e^(-5s) - 4e^(-6s)) / s[/tex]
Hence, the Laplace transform of f(t) is F(s) = [tex](6e^(-2s) + 3e^(-5s) - 4e^(-6s)) / s.[/tex]
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Note: enter your answer and show all the steps that you use to solve this problem in the space provided.
find the area of the parallelogram.
8 cm
9 cm
24 c.m.
not drawn to scale.
i need help i don’t understand
To find the area of a parallelogram, multiply the base length by the height. Therefore, the area of the parallelogram is 8 cm * 24 cm = 192 cm².
How to find the area of the parallelogram with side lengths 8 cm, 9 cm, and a height of 24 cm?To find the area of a parallelogram, you can use the formula A = base × height. In this case, the given measurements are 8 cm for the base, 9 cm for the height, and 24 cm for one of the sides of the parallelogram.
First, identify the base and height of the parallelogram. In this case, the base is 8 cm and the height is 9 cm.
Next, substitute the values into the formula for the area of a parallelogram: A = base × height.
A = 8 cm × 9 cm
Multiply the base and height:
A = 72 cm²
Therefore, the area of the parallelogram is 72 square centimeters. It's important to note that the area is not drawn to scale, so the measurements given are solely used for calculation purposes.
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PLEASE HELP MEH
A 1,700-foot support wire is attached to
the top of an 800-foot radio tower.
1,700 ft
800 ft
А
B
A scale drawing of the tower and wire is
drawn using the scale 1 inch: 250 feet.
On the scale drawing, what is the length,
in inches, of AB? (8. 1B, 8. 1F)
F
15 in.
Make sure to
use the scale.
G 7. 5 in.
H
6 in.
J 18 in.
We know that the length of AB on the scale drawing is 10 inches
Using the scale of 1 inch: 250 feet, we can find the length of AB on the scale drawing by multiplying the actual length of AB by the scale factor.
The actual length of AB is the sum of the height of the tower (800 ft) and the length of the support wire (1,700 ft), which is 2,500 ft.
Multiplying 2,500 ft by the scale factor of 1 inch: 250 feet, we get:
2,500 ft ÷ 250 ft/inch = 10 inches
Therefore, the length of AB on the scale drawing is 10 inches.
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The radius of a base is 9 cm. The height is 12 cm . What is the volume of the cone?
volume =πr^2h
=π(9)^2*12
=π81*12
=972πcm^3
Two random samples 4. 49, 7. 68, 5. 97, 0. 97, 6. 88, 6. 07, 03. 08, 04. 02, 03. 83, 6. 35, and 4. 59, 3. 39, 3. 79, 6. 89, 5. 07, 07. 41, 0. 44, 2. 47, 4. 80, 7. 23 were obtained independently from distributions with the same mean. Perform a permutation test to test the hypothesis that the variability in both populations is the same against the alternative that it is larger in the second population. As a test statistic use: (i) The difference of sample ranges. (ii) The ratio of sample variances. (iii) Compare both results
A. Main Answer:
The hypothesis that the variability in both populations is the same against the alternative that it is larger in the second population, we can perform a permutation test using two different test statistics:
(i) the difference of sample ranges and
(ii) the ratio of sample variances. By comparing the results of both test statistics, we can draw conclusions about the variability in the populations.
(i) Difference of Sample Ranges:
1. Calculate the sample range for each sample. The sample range is the difference between the maximum and minimum values in the sample.
Sample 1 Range = Maximum value - Minimum value for Sample 1
Sample 2 Range = Maximum value - Minimum value for Sample 2
2. Calculate the observed difference of sample ranges, which is the difference between the sample range of Sample 2 and Sample 1.
3. Pool the data from both samples and shuffle them randomly, keeping the same sample sizes.
4. Calculate the difference of sample ranges for the shuffled data.
5. Repeat steps 3 and 4 many times (e.g., 1000 permutations) to obtain a distribution of the difference of sample ranges under the null hypothesis (where variability is the same in both populations).
6. Compare the observed difference of sample ranges from step 2 with the distribution obtained from the permutations.
(ii) Ratio of Sample Variances:
1. Calculate the sample variance for each sample.
2. Calculate the observed ratio of sample variances, which is the ratio of the sample variance of Sample 2 to the sample variance of Sample 1.
3. Pool the data from both samples and shuffle them randomly, keeping the same sample sizes.
4. Calculate the ratio of sample variances for the shuffled data.
5. Repeat steps 3 and 4 many times (e.g., 1000 permutations) to obtain a distribution of the ratio of sample variances under the null hypothesis.
6. Compare the observed ratio of sample variances from step 2 with the distribution obtained from the permutations.
By comparing the results of both test statistics, we can assess whether the variability in the second population is significantly larger than the first population. If both test statistics consistently indicate larger variability in the second population, it provides evidence against the null hypothesis and suggests that the variability in the second population is indeed larger.
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Maria is currently taking quantitative literacy course. The instructor often gives quizzes. Each quiz is worth
10 points. Maria got the following scores: 10, 9, 10, 9, 10.
(a) Calculate the average of her quizzes. Round your answer to the nearest tenth (if needed).
(b) Calculate standard deviation of her quizzes. Round your answer to the nearest tenth.
Maria's average quiz score is 9.6.
B. The standard deviation of her quizzes is approximately 0.5 (rounded to the nearest tenth).
What is the average?(a) The average of Maria's quizzes can be found by adding up all her scores and dividing by the total number of quizzes:
Average = (10 + 9 + 10 + 9 + 10) / 5 = 9.6
Therefore, Maria's average quiz score is 9.6.
(b) To calculate the standard deviation of her quizzes, we first need to find the variance. We can do this by finding the average of the squared differences between each score and the mean:
[(10 - 9.6)² + (9 - 9.6)² + (10 - 9.6)² + (9 - 9.6)² + (10 - 9.6)²] / 5 = 0.24
So the variance is 0.24. To find the standard deviation, we take the square root of the variance:
√0.24 ≈ 0.5
So the standard deviation of her quizzes is approximately 0.5 (rounded to the nearest tenth).
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I NEED INEQUALITY!!! WILL MARK BRAINLY + 50 POINTS IF GIVEN VALID ANSWER !!!!!!Your ice-cream cart can hold 550 frozen treats. Your friend Anna also has an ice-cream cart and sold frozen treats last summer. She has agreed to help you decide which frozen treats to sell.
Table 1 displays the cost to you, the selling price, and the profit of some frozen treats.
Choco bar cost you $0.75 ea, selling price $2.00, profit for each sale $1.25
Ice cream sandwich cost you $0.85 each, selling price $2.25, profit $1.40
Frozen fruit bar cost you $0.50 each, selling price $1.80, profit $1.30
Your budget is to spend no more than $450 on frozen treats.
Enter an INEQUALITY to represent the number of chocolate fudge bars, C, the number of ice-cream sandwiches, I, and the number of frozen fruit bars, F, that will cost you no more than $450.
Answer:
$450
Step-by-step explanation:
Let's use the variables C, I, and F to represent the number of chocolate fudge bars, ice cream sandwiches, and frozen fruit bars, respectively, that you will sell.
The cost of each chocolate fudge bar is $0.75, the cost of each ice cream sandwich is $0.85, and the cost of each frozen fruit bar is $0.50. Therefore, the total cost of the frozen treats that you buy will be:
Total cost = 0.75C + 0.85I + 0.50F
We want to make sure that this total cost is no more than $450. Therefore, we can write the following inequality:
0.75C + 0.85I + 0.50F ≤ 450
This inequality represents the number of chocolate fudge bars, C, the number of ice-cream sandwiches, I, and the number of frozen fruit bars, F, that will cost you no more than $450.
(x+2)^1/2-5=-2
Answers is x=7
SHOW WORK
[tex](\text{x}+2)^{1/2}-5 = -2\\\\\sqrt{\text{x}+2}-5 = -2\\\\\sqrt{\text{x}+2} = -2+5\\\\\sqrt{\text{x}+2} = 3\\\\(\sqrt{\text{x}+2})^2 = 3^2\\\\\text{x}+2= 9\\\\\text{x}= 9-2\\\\\text{x}= 7\\\\[/tex]
-----------------------
Check:
[tex](\text{x}+2)^{1/2}-5 = -2\\\\\sqrt{\text{x}+2}-5 = -2\\\\\sqrt{7+2}-5 = -2\\\\\sqrt{9}-5 = -2\\\\3-5 = -2\\\\-2 = -2 \ \ \ \checkmark\\\\[/tex]
The answer is confirmed.
-----------------------
Answer: x = 7What is the area of the sector bounded by the arc?
The given circle has a radius of 3 m and the shaded
section has an arc length of 47 m.
nº
Arc length
Circumference
360°
3 m
WIN
nº
360°
arc length
40 m
nº
Area = (97)
360°
Area = { (97)
bem?
The area of the sector is approximately 23.24 m^2.
How to find the area?To find the area of the sector, we first need to find the central angle of the sector.
The entire circumference of the circle is given by 2πr, where r is the radius of the circle. In this case, the circumference is 2π(3) = 6π m.
The arc length given is 47 m, which we can use to find the central angle of the sector:
central angle = (arc length / circumference) × 360°
central angle = (47 / 6π) × 360°
central angle ≈ 299.02°
Now that we have the central angle, we can use the formula for the area of a sector:
area of sector = (central angle / 360°) × πr^2
area of sector = (299.02 / 360) × π(3)^2
area of sector ≈ 7.43π m^2
Rounding to two decimal places, the area of the sector is approximately 23.24 m^2.
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n a circle, a 180 degree sector has area 162\pi in Superscript 2. What is the radius of the circle?
The radius of the circle is 10 inches.
Area of a sector.A sector is a part of a given circle which is made from two radii and an arc. It's area can be determined by;
area of a sector = θ/360*πr^2
where θ is the measure of its central angle, and r is its radius.
Then from the given question, we have;
area of a sector = θ/360*πr^2
162 = 180/360 *3.14*r^2
= 1.57r^2
r^2 = 162/1.57
= 103.1847
So that;
r = (103.1847)^1/2
= 10.16
The radius of the circle is approximately 10 inches.
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Which cardboard box can hold the greatest number of 1 in x 2 in x 4 in sponges
The cardboard box with the largest volume can hold the greatest number of 1 in x 2 in x 4 in sponges.
To find the box with the largest volume, first determine the volume of each sponge: V_sponge = 1 in x 2 in x 4 in = 8 cubic inches. Next, find the volume of each box by multiplying its length, width, and height (V_box = L x W x H).
To determine how many sponges each box can hold, divide the volume of the box by the volume of the sponge (V_box / V_sponge). The box with the highest resulting quotient can hold the most 1 in x 2 in x 4 in sponges.
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During a lab experiment, the
temperature of a liquid changes
from 63 °f to 102°f.
what is the percent of increase
in the temperature of the
liquid?
The percent increase in temperature of the liquid is 61.9%. This means that the temperature increased by 61.9% of its original value.
What is the percentage increase in temperature of a liquid that changes from 63°F to 102°F during a lab experiment?When we want to calculate the percent increase in a value, we need to compare the new value to the old value.
In this case, the old value is the initial temperature of the liquid, which is 63 °F, and the new value is the final temperature of the liquid, which is 102 °F.
To calculate the percent increase, we use the formula I mentioned earlier, which subtracts the old value from the new value, divides the result by the old value.
And then multiplies the quotient by 100% to express the result as a percentage.
So, for this experiment, we can calculate the percent increase in temperature as:
((102 - 63) / 63) x 100% = 61.9%
This means that the temperature of the liquid increased by 61.9% of its original value. Alternatively, we can also say that the final temperature is 161.9% of the initial temperature.
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Write an equation to represent the following statement.
282828 is 121212 less than kkk.
An equation representing the statement that 282828 is 121212 less than kkk is kkk = 282828 + 121212.
What is an equation?An equation is a mathematical statement showing that two or more mathematical or algebraic expressions share equality or equivalence.
Equations are represented using the equal symbol (=).
Unlike equations, mathematical expressions do not use the equal symbol.
282828 = kkk - 121212
kkk = 282828 + 121212
Thus, one way of representing the statement that that 282828 is 121212 less than kkk is by forming an equation like kkk = 282828 + 121212.
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A study was conducted to determine the relationship existing between the grade in english and the grade in mathematics. a random sample of 10 cte students in uc were taken and the following are the results of the sampling th a)compute for the pearson( r) - 10pts b) state null and alternative hypothesis- 5pts b)find equation of regression line- 5pts c) interpret and conclude results - 5pts student 1 2 3 4 5 6 7 8 9 10 english 75 83 80 77 89 78 92 86 93 84 mathematics 78 87 78 76 92 81 89 89 91 84
a) The Pearson correlation coefficient is 0.76.
b) Null hypothesis: There is no significant correlation between the grades in English and Mathematics (H0: r = 0)
Alternative hypothesis: There is a significant correlation between the grades in English and Mathematics (Ha: r ≠ 0)
c) The regression line is: y = 0.64x + 34.18
d) Interpretation and conclusion: The Pearson correlation coefficient (r) of 0.76 indicates a strong positive correlation between the grades in English and Mathematics.
Correlation analysis:
Using the Pearson correlation coefficient to measure the strength and direction of the linear relationship between two variables.
Hypothesis testing:
Setting up null and alternative hypotheses, and using the t-test to determine whether the correlation coefficient is statistically significant.
Linear regression:
Finding the equation of the regression line that best describes the relationship between the two variables.
Interpretation and conclusion:
Using the results of the analysis to draw meaningful conclusions about the relationship between the two variables and the sample population as a whole.
Here we have
A study was conducted to determine the relationship existing between the grade in English and the grade in mathematics. a random sample of 10 students in uc was taken and the following are the results of the sampling
Student 1 2 3 4 5 6 7 8 9 10
English 75 83 80 77 89 78 92 86 93 84
Mathematics 78 87 78 76 92 81 89 89 91 84
a) To compute the Pearson correlation coefficient (r), first calculate the mean, standard deviation, and covariance of the two variables:
Mean of English grades (x)
= (75+83+80+77+89+78+92+86+93+84)/10 = 83.7
Mean of Math grades (y)
= (78+87+78+76+92+81+89+89+91+84)/10 = 84.5
The standard deviation of English grades (Sx)
= √((75-83.4)²+(83-83.4)²+...+(84-83.4)²)/9) = 6.52
The standard deviation of Math grades (Sy)
= √((78-84.4)²+(87-84.4)²+...+(84-84.4)²)/9) = 5.47
Covariance of the two variables
= ((75-83.4)(78-84.4)+(83-83.4)(87-84.4)+...+(84-83.4)(84-84.4))/9 = 26.6
Using the formula, r = cov(X,Y)/(SxSy),
we can calculate the correlation coefficient as follows
r = 26.6/(6.52*5.47) = 0.76
Therefore,
The Pearson correlation coefficient is 0.76.
b) Null hypothesis: There is no significant correlation between the grades in English and Mathematics (H0: r = 0)
Alternative hypothesis: There is a significant correlation between the grades in English and Mathematics (Ha: r ≠ 0)
c) To find the equation of the regression line, we need to calculate the slope (b) and the intercept (a) of the line. The formula for the slope is:
b = r(Sy/Sx) = 0.76(5.47/6.52) = 0.64
The formula for the intercept is:
=> a = y - bx = 84.4 - 0.64(83.4) = 34.18
Therefore,
The equation of the regression line is:
y = 0.64x + 34.18
Interpretation and conclusion:
The Pearson correlation coefficient (r) of 0.76 indicates a strong positive correlation between the grades in English and Mathematics.
The p-value associated with this correlation coefficient can be used to test the null hypothesis.
The equation of the regression line shows that for every one-point increase in the English grade, the predicted increase in the Mathematics grade is 0.64 points.
Therefore,
a) The Pearson correlation coefficient is 0.76.
b) Null hypothesis: There is no significant correlation between the grades in English and Mathematics (H0: r = 0)
Alternative hypothesis: There is a significant correlation between the grades in English and Mathematics (Ha: r ≠ 0)
c) The regression line is: y = 0.64x + 34.18
d) Interpretation and conclusion: The Pearson correlation coefficient (r) of 0.76 indicates a strong positive correlation between the grades in English and Mathematics.
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Find the limit.
lim e5t - 1/ t sin(t)
The limit of the given function as t approaches 0 is undefined.
To find the limit of the given function,[tex]lim (e^(5t) - 1) / (t × sin(t))[/tex] as t approaches 0, follow these steps:
Observe the given function
[tex]lim (e^(5t) - 1) / (t × sin(t)) as t → 0[/tex]
Apply L'Hopital's Rule, since the limit is of the form 0/0 as t approaches 0.
Differentiate the numerator and denominator with respect to t.
Numerator: [tex]d(e^(5t) - 1)/dt = 5e^(5t)[/tex]
Denominator: [tex]d(t × sin(t))/dt = sin(t) + t × cos(t)[/tex]
Rewrite the function with the new numerator and denominator.
lim [tex](5e^(5t)) / (sin(t) + t × cos(t)) as t → 0[/tex]
Evaluate the limit as t approaches 0.
[tex](5e^(5 × 0)) / (sin(0) + 0 × cos(0)) = 5 / 0[/tex]
Since the denominator is still 0, the limit does not exist.
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Earth's distance from the sun is 1. 496 x 108 km. Saturn's distance from the sun is 1. 4246 x 10 km. How many times further from the sun is Saturn? Explain how you arrived at your answer.
Saturn is approximately 9.52 times further from the sun than Earth.
To find out how many times further from the sun Saturn is compared to Earth, we need to divide Saturn's distance from the sun by Earth's distance from the sun.
First, let's correct the distances given:
- Earth's distance from the sun: 1.496 x 10^8 km
- Saturn's distance from the sun: 1.4246 x 10^9 km (I assume you missed the exponent)
Now, let's calculate the ratio:
Ratio = (Saturn's distance) / (Earth's distance)
Ratio = (1.4246 x 10^9 km) / (1.496 x 10^8 km)
To make the calculation easier, let's factor out the common exponent (10^8):
Ratio = (1.4246 x 10) / (1.496)
Ratio ≈ 9.52
So, Saturn is approximately 9.52 times further from the sun than Earth.
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HELP DUE IN 5 min Area=?
Answer:
The answer to your problem is, 39
Step-by-step explanation:
In order to find the area of the triangle use the formula down below:
A = [tex]\frac{h_{b} b}{2}[/tex]
Base = 13
Height = 6
Replace them equals:
= [tex]\frac{6*13}{2}[/tex] = 39
Thus the answer to your problem is, 39
Aria ate the pictured slice of pizza. If the original
pizza was 8 inches in diameter, what is the area
of the slice she ate?
Answer:
Step-by-step explanation:
50.24n2
Make sure to include your null and alternative hypothesis, your test statistic, your p-value, decision, and conclusion in the context in your response. A poll conducted by the General Social Survey asked a random sample of 1325 adults in the United States how much confidence they had in banks and other financial institutions. A total of 149 adults said they had a great deal of confidence. An economist claims that less than 15% of US adults have great confidence in banks. Use a= 0. 05 can you conclude that the economist's claim is true?Use a=0. 01 can you conclude that the economist's claim is true?
At both the 5% and 1% significance levels, we have enough evidence to reject the null hypothesis that the proportion of US adults who have great confidence in banks is 15% or higher. Therefore, we can conclude that the economist's claim that less than 15% of US adults have great confidence in banks is supported by the data.
Null Hypothesis: The proportion of US adults who have great confidence in banks is 15% or higher.
Alternative Hypothesis: The proportion of US adults who have great confidence in banks is less than 15%.
We can use a one-tailed z-test to test the economist's claim.
The test statistic is
z = (P - p) / √(p * (1-p) / n)
where P is the sample proportion, p is the hypothesized proportion, and n is the sample size.
Using the sample data, we have
P = 149/1325 = 0.1121
p = 0.15
n = 1325
The test statistic is
z = (0.1121 - 0.15) / √(0.15 × (1-0.15) / 1325) = -3.196
Using a significance level of α = 0.05, the critical value for a one-tailed test is -1.645. Since our test statistic is less than the critical value, we reject the null hypothesis.
The p-value for this test is P(Z < -3.196) = 0.0007. Since the p-value is less than the significance level of 0.05, we reject the null hypothesis.
At the 5% significance level, we have enough evidence to reject the null hypothesis that the proportion of US adults who have great confidence in banks is 15% or higher. Therefore, we can conclude that the economist's claim that less than 15% of US adults have great confidence in banks is supported by the data.
Using a significance level of α = 0.01, the critical value for a one-tailed test is -2.33. Since our test statistic is less than the critical value, we reject the null hypothesis.
The p-value for this test is P(Z < -3.196) = 0.0007. Since the p-value is less than the significance level of 0.01, we reject the null hypothesis.
At the 1% significance level, we have enough evidence to reject the null hypothesis that the proportion of US adults who have great confidence in banks is 15% or higher. Therefore, we can conclude that the economist's claim that less than 15% of US adults have great confidence in banks is supported by the data.
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