to increase strength and/or muscle mass, weight trainers will try different approaches. one approach is to apply an electrical impulse through a
muscle as the person is lifting a weight. a researcher wants to determine if adding this electrical impulse increases the amount of weight a person
can lift. to conduct his research, he selects one hundred people, and randomly divides them into two groups. one group wears a device that
sends an electrical impulse through the muscle used to repeatedly lift a 5 pound weight. the other group lifts the same weight without the electrical
impulse. the researcher counts the number of repetitions until the subjects can no longer lift the weight. is this an example of an observational
study or an experiment?

Since segment CD is the mid-segment of trapezoid WXYZ, it means that segment CD is parallel to both bases WX and YZ and it is also half the length of their sum. Therefore, we can use the mid-segment formula which states that the length of segment CD is equal to the average of the lengths of the bases WX and YZ.

So, we can write:

CD = (WX + YZ)/2

Since we want to find the value of XY, we need to know its length in terms of WX and YZ.

If we draw a diagonal of the trapezoid, say diagonal WZ, it will divide the trapezoid into two triangles, namely triangle WXY and triangle ZYX.

We know that the mid-segment CD is also the median of triangle WZY, so it divides it into two equal areas.

Therefore, the area of triangle WXY is equal to the area of triangle ZYX.

We can write:

1/2 * WX * CD = 1/2 * YZ * CD

Simplifying this equation by dividing both sides by CD, we get:

1/2 * WX = 1/2 * YZ

Multiplying both sides by 2, we get:

WX = YZ

Therefore, the trapezoid WXYZ is actually an isosceles trapezoid with equal bases WX and YZ.

So, we can substitute WX for YZ in the formula for CD:

CD = (WX + WX)/2

Simplifying this equation, we get:

CD = WX

Therefore, the length of segment XY is equal to the length of the shorter base of the trapezoid, which is WX.

So, the value of XY is equal to the value of WX, and we can conclude that XY = WX.

Learn more about trapezoid at https://brainly.com/question/31371933

#SPJ11

The expression for AB in terms of x and √3 is:

AB = x√3.

An expression in mathematics is a combination of numbers, variables, and/or operators that represents a mathematical relationship or quantity. It may contain constants, variables, coefficients, and mathematical operations such as addition, subtraction, multiplication, division, and exponentiation. Expressions are often used to describe or represent real-world situations, and can be simplified, evaluated, or manipulated using algebraic rules and properties.

In the given question,

In a right triangle ABC, if sin B = 0.5, then we know that:

sin B = opposite / hypotenuse

So, we can write:

0.5 = AB / CB

We also know that:

CB² = AB² + AC²

Substituting the value of AC, we get:

CB² = AB² + (3x)²

CB² = AB² + 9x²

Now, we can substitute the value of CB² from the first equation:

(AB / 0.5)² = AB² + 9x²

4AB² = AB² + 9x²

3AB² = 9x²

AB² = 3x²

The expression for AB in terms of x and √3 is:

AB = x√3

To know more about expression, visit:

https://brainly.com/question/14083225

#SPJ1

Answer: Let's start by subtracting the cost of the glider airplane from the total amount of money you started with:

$20 - $3 = $17

We know that you spent $15 of that $17 on the bouncy ball, since you had $15 left over after buying both items:

$17 - $15 = $2

Therefore, you spent $2 on the bouncy ball.

Answer: $2.

Step-by-step explanation:

To make the second prism, Jessica needs an additional 25.2 cm of material.

To answer your question, since Jessica wants to create a second triangular prism with a scale factor of 3, she will need 3 times the material used for the first prism.

She used 12.6 cm for the first prism, so for the second prism, she would need 12.6 cm × 3 = 37.8 cm of material.

Jessica already has 300 cm of material, so to find out how much more she needs, subtract the amount used for the first prism: 37.8 cm - 12.6 cm = 25.2 cm.

Jessica needs an additional 25.2 cm of material to make the second prism.

More on prism: https://brainly.com/question/27214726

#SPJ11

To find the volume (cubic inches) of the ball, we first need to find its radius, which is half the diameter.

Radius = 12 in / 2 = 6 in

Now we can use the formula for the volume of a sphere:

Volume = (4/3) x π x radius^3 cubic inches

Volume = (4/3) x π x 6^3

Volume ≈ 904.8 cubic inches

So the ball holds approximately 904.8 cubic inches of air. Rounded to the nearest tenth, the answer is 904.8.

Learn more about cubic inches: https://brainly.com/question/29404523

#SPJ11

Answer:

D(6,4).

Step-by-step explanation:

The shape ABCD is a square.

By definition, the diagonals are equal.

The diagonal from A to C is 6 units long. Therefore, you should get your point D by drawing across from B to the right by 6.

D(6,4).

The correct answer is (C) -8x12.

To simplify (4x^4)^-3, we use the power of a power rule which states that (a^m)^n = a^(mn), where a is a non-negative number and m and n are integers. Applying this rule, we get:

(4x^4)^-3 = 4^(-3) x^(4 x -3) = (1/64)x^(-12) = -8x^12 (using the negative exponent rule, which states that a^(-n) = 1/a^n)

Therefore, the simplified form of (4x^4)^-3 is -8x^12.

To know more about power rule refer here:

https://brainly.com/question/23418174

#SPJ11

Answer:

C. 6/10

Step-by-step explanation:

Sin A = 6/10

The 95% confidence interval for the population mean 30-year fixed mortgage rate is (6.091%, 6.709%), and the 99% confidence interval is (5.993%, 6.807%).

To estimate the mean 30-year fixed mortgage rate for a home loan in the United States using a random sample of 10 recent loans with an average of 6.40% and a population standard deviation of 0.5%, you can compute the 95% and 99% confidence intervals as follows:

1: Identify the sample mean (x), sample size (n), and population standard deviation (σ).

x = 6.40%

n = 10

σ = 0.5%

2: Calculate the standard error (SE) using the formula SE = σ/√n.

SE = 0.5%/√10 ≈ 0.158%

3: Determine the critical z-values for 95% and 99% confidence intervals.

For a 95% confidence interval, z = 1.96 (from the z-table)

For a 99% confidence interval, z = 2.576 (from the z-table)

4: Calculate the margin of error (ME) using the formula ME = z * SE.

For 95% CI,

ME = 1.96 * 0.158% ≈ 0.309%

For 99% CI,

ME = 2.576 * 0.158% ≈ 0.407%

5: Compute the confidence intervals by adding and subtracting the ME from the sample mean.

95% CI:

(6.40% - 0.309%, 6.40% + 0.309%) = (6.091%, 6.709%)
99% CI:

(6.40% - 0.407%, 6.40% + 0.407%) = (5.993%, 6.807%)

So, the 95% confidence interval and 99% confidence interval is (6.091%, 6.709%) and (5.993%, 6.807%) respectively.

Learn more about Confidence interval:

https://brainly.com/question/20309162

#SPJ11

a.The radius of the hot tub is 4 feet. b. The amount of water that the hot tub can hold is 176.96 cubic feet c. The amount of water that Rita should put in the hot tub in order to follow the recommendation is 141.57 cubic feet.

a. Find the radius of the hot tub.

Given: Circumference = 25.12 feet

Formula: Circumference = 2 * pi * radius

1: Plug in the given circumference and the value of pi.

25.12 = 2 * 3.14 * radius

2: Solve for the radius.

radius = 25.12 / (2 * 3.14)

radius ≈ 4 feet

So, the hot tub's radius is 4 feet.

b. How much water can the hot tub hold?

Given: Radius = 4 feet, Depth = 3.5 feet

Formula: Volume = pi * radius^2 * depth

1: Plug in the radius, depth, and the value of pi.

Volume = 3.14 * (4^2) * 3.5

2: Calculate the volume.

Volume ≈ 176.96 cubic feet

So, the hot tub can approximately hold 176.96 cubic feet.

c. How much water should Rita put in the hot tub to follow the recommendation?

Given: Recommended capacity = 80% of full capacity

Formula: Recommended water = 0.8 * full capacity

1: Plug in the full capacity (volume) calculated in part b.

Recommended water = 0.8 * 176.96

2: Calculate the recommended water amount.

Recommended water ≈ 141.57 cubic feet

So, Rita should put approximately 141.57 cubic feet of water in the hot tub to follow the recommendation.

Learn more about Volume:

https://brainly.com/question/1972490

#SPJ11

The y-intercept of the line is -13.

To find the y-intercept of the line, we can use the slope-intercept form of the equation of a line: y = mx + b,

where m is the slope and b is the y-intercept.

Given that the line passes through the point (-10, 52) and has a slope of -6.5, we can substitute these values into the equation:

52 = -6.5(-10) + b

Simplifying the equation:

52 = 65 + b

To isolate b, we subtract 65 from both sides:

52 - 65 = b

Simplifying further:

b = -13

For similar question on y-intercept.

https://brainly.com/question/30239450

#SPJ11

The part of the figure marked ? is solved to be

113 degrees

The part of the circle marked by a question mark is solved using the relation as shown below

given angle formed by the tangents = 180 degrees - minor arc GE

information given in the problem includes

given angle formed by the tangents = 67 degrees

minor arc GE = ?

plugging in these values results to

67 degrees = 180 degrees - ?

rearranging the equation

? = 180 degrees - 67

? = 113

hence the required side is 113 degrees

Learn more about circle at

https://brainly.com/question/30385886

#SPJ1

Answer: A

Step-by-step explanation:

It's A because our function of f is multiplied by 3.

Since our y intercept is 1, and we are multiplying the function f by 3,

our new y intercept is 3, meaning it is A.

Another way to check this is by using the other two points on your graph.

Please give brainliest + have a good afternoon.

Answer:

Step-by-step explanation:

Your original function has points at

0, 1

1, 2

2,4  

if you stretched it by 3, multiply your y by 3

new function:

0, 3

1, 6

2, 12

Answer:

The first box and whisker plot

Step-by-step explanation:

A box and whisker plot gives you the five number summary for a set of data.  The five number summary is

Maximum and minimum:

We know from the data that the minimum value is 100 and the maximum value is 200.  However, because both boxes available as answer choices have the correct minimum and maximum, we'll need to find more data.

Median:

We can start finding the median first by arranging the data from the least to greatest.  Then, we find the middle of the data.  Because there are 9 points and 9 is odd, we know that there will be 4 points to the left of the median and 4 points to the right of the median:

100, 100, 120, 120, 150, 165, 180, 180, 200

150 has 4 numbers both on its left and right sides so its the median.

Because both of the plots available as answer choices have the correct median, we we'll need to find more data.

First Quartile/Q1:

In order to find Q1, we must find the middle number of the four numbers to the left of the median.

Because we have an even number of points, we will get two middle numbers, 100 and 120.  To find the middle of all four points, we average these two numbers:

(100 + 120) / 2 = 220 / 2 = 110

Only the first box has the accurate Q1 value, so it's our answer.

We don't have to find Q3, since both boxes have the correct Q3, but only the first box has the correct minimum, correct Q1, correct median, correct Q3, correct maximum.

To find f(-1), we can use the fact that the derivative of a function f(x) gives us the slope of the tangent line to the graph of f(x) at any point x. We can use this information along with the given value of f(1) to find the equation of the tangent line at x=1, and then use that equation to find the value of f(-1).

First, we find the equation of the tangent line at x=1:
- The slope of the tangent line at x=1 is f'(1) = 833 + 12(1) + 2 = 847
- The point (1, f(1)) lies on the tangent line, so we can use the point-slope form of the equation of a line to write the equation of the tangent line:
y - (-4) = 847(x - 1)
y + 4 = 847x - 847
y = 847x - 851

Now we can use this equation to find f(-1):
- The point (-1, f(-1)) also lies on the tangent line, so we can substitute x=-1 and solve for y:
f(-1) + 4 = 847(-1) - 851
f(-1) + 4 = -1698
f(-1) = -1702

Therefore, f(-1) = -1702.
To find f(-1), we first need to determine the function f(x). We know f'(x) = 833 + 12x + 2. To find f(x), we need to integrate f'(x) with respect to x:

∫(833 + 12x + 2) dx = 833x + 6x^2 + 2x + C

Now, we use the given condition f(1) = -4 to find the constant C:

-4 = 833(1) + 6(1)^2 + 2(1) + C

Solve for C:

C = -4 - 833 - 6 - 2 = -845

Now we have the function f(x) = 833x + 6x^2 + 2x - 845. To find f(-1), plug in x = -1:

f(-1) = 833(-1) + 6(-1)^2 + 2(-1) - 845

f(-1) = -833 + 6 - 2 - 845

f(-1) = -1674

So, f(-1) equals -1674.

To learn more about function visit;

brainly.com/question/12431044

#SPJ11

The initial number of video views was fewer than the initial number of site visits, and the number of video views grew by a larger factor than the number of site visits. The difference between the total number of site visits and the video views after 5 weeks is 20,825.

During their team meeting, both managers shared their findings. Complete the statement describing their combined results.

The initial number of video views was fewer than the initial number of site visits, and the number of video views grew by a larger factor than the number of site visits.

The difference between the total number of site visits and the video views after 5 weeks is 20,825.

Therefore the correct answer are fewer, larger factor than and 20,825.

Read more about video.

https://brainly.com/question/15245269

#SPJ11

An appropriate and interesting word for 15,000 is "fifteen thousand," while for 3,000, it is "three thousand."

To solve this question, we need to write the numbers 15,000 and 3,000 as words. To do this, first, we look at the place values of each digit. In 15,000, the "15" is in the thousands place, so we write it as "fifteen thousand." Similarly, in 3,000, the "3" is in the thousands place, so we write it as "three thousand."

By doing this, we have expressed the numbers using their word forms, which helps in understanding and communicating numerical values more effectively, especially in written or spoken contexts. Remember, when writing large numbers as words, we use the place values to guide us in expressing them accurately and understandably.

To know more about numerical values click on below link:

https://brainly.com/question/13085451#

#SPJ11

The percent discount on the sneakers is 10%

Casho paid $22.50 before tax, despite the item's $25 tag price. The discount is the difference between the original price and the sale price, which is $25 - $22.50 = $2.50.

The discount is the difference between the original price and the discounted price, expressed as a percentage of the original price.

To find the percent discount, we divide the discount by the original price and multiply by 100:

Percent discount = (discount / tag price) x 100

Percent discount = ($2.50 / $25) x 100

Percent discount = 0.1 x 100

Percent discount = 10%

Therefore, the percent discount on the sneakers is 10%

Learn more about Discount here

https://brainly.com/question/3541148

#SPJ4

The function f(z) = 1 + 6x + 96x^-1 has one local minimum and one local maximum. This function has a local maximum at x. The function f(x) = 1 + 6x + 96x^(-1) has a local maximum at x = -4.

To find the local maximum of the function f(x) = 1 + 6x + 96x^(-1), we first need to find the critical points. We do this by finding the first derivative of the function and setting it equal to zero.

Step 1: Find the derivative of the function
f'(x) = d/dx (1 + 6x + 96x^(-1))
f'(x) = 6 - 96x^(-2)

Step 2: Set the derivative equal to zero and solve for x
6 - 96x^(-2) = 0

Step 3: Solve for x
96x^(-2) = 6
x^(-2) = 6/96
x^(-2) = 1/16
x^2 = 16
x = ±4

Step 4: Determine which of the critical points is a local maximum. To do this, we will examine the second derivative of the function.

f''(x) = d^2/dx^2 (1 + 6x + 96x^(-1))
f''(x) = 192x^(-3)

Now we will evaluate the second derivative at each critical point:

f''(4) = 192(4)^(-3) = 3 > 0, so x = 4 is a local minimum.
f''(-4) = 192(-4)^(-3) = -3 < 0, so x = -4 is a local maximum.

Therefore, the function f(x) = 1 + 6x + 96x^(-1) has a local maximum at x = -4.

to learn more about the second derivative click here:

https://brainly.com/question/30747891

#SPJ11

The velocity of the bowling ball is approximately 20.104 meters per second.

The pace at which an object's position changes in relation to a frame of reference and time is what is meant by velocity.

The formula given is used to calculate the velocity of a moving object in meters per second, given the object's mass in kilograms and its kinetic energy in joules. The formula is:

V = √(2E/m)

where V is the velocity, E is the kinetic energy, and m is the mass of the object.

To use this formula to find the velocity of the bowling ball, we need to substitute the given values into the formula. The mass of the bowling ball is 5.5 kilograms, and the kinetic energy is 2223 joules. Substituting these values, we get:

V = √(2 × 2223 J / 5.5 kg)

Now, we can simplify the equation:

V = √(404.1818)

Using a calculator, we can find the square root of 404.1818:

V = 20.104 m/s (rounded to three decimal places)

Therefore, the velocity of the bowling ball is approximately 20.104 meters per second.

This formula is useful for calculating the velocity of a moving object when the mass and kinetic energy of the object are known. It can be used in a variety of situations, such as in physics experiments, engineering design, or in understanding the motion of objects in sports.

To learn more about velocity click:

https://brainly.com/question/80295?source=archive

#SPJ1

Answer:

Domain is all x values

Range is all y values

Step-by-step explanation:

Your image is not clear enough for me to see the x or y coordinates so hope that helps you to figure it out on your own

Answer:

209.07 pounds

Step-by-step explanation:

radius= 8÷2=4 feet

volume of hemisphere=((4/3)×(22/7)×r^3)/2

=134.09 cubic feet

Mass=density × volume

=86×134.09

=209.07 pounds

The evaluation of the repeated integral is None of these. (option f)

The repeated integral given is ∫∫∫(-xy + 2z) dz dy dx over the region lolla. This means that you need to integrate the function (-xy + 2z) with respect to z, then with respect to y, and finally with respect to x over the region lolla.

To evaluate this integral, you can use the method of iterated integrals. First, integrate (-xy + 2z) with respect to z, treating x and y as constants:

∫∫(-xy + 2z) dz = -xyz + z² + C

where C is the constant of integration.

Next, integrate the result of the first integral with respect to y, treating x as a constant:

∫[-xyz + z² + C] dy = -xyz + y[-xyz + z² + C] + D

where D is the constant of integration.

Finally, integrate the result of the second integral with respect to x:

∫[-xyz + y(-xyz + z² + C) + D] dx = (-1/2) x² yz + xy(-xyz + z² + C) + Dx + E

where E is the constant of integration.

Now, you need to evaluate this expression over the region lolla. Without further information about the limits of integration for each variable, it is not possible to determine the exact value of this integral.

Therefore, the correct answer is f) None of these.

To know more about integral here

https://brainly.com/question/18125359

#SPJ4

The new volume of the BigMini tablet is about 22.18 cubic inches.

The volume of a three-dimensional object, such as a tablet, is calculated by multiplying its length, width, and height.

Assuming that the scale factor of 1.25 is applied uniformly to all three dimensions of the iPad Mini 2, the new dimensions of the BigMini tablet would be:

Length: 1.25 x 7.87 inches = 9.84 inches

Width: 1.25 x 5.3 inches = 6.63 inches

Height: 1.25 x 0.29 inches = 0.36 inches

The new volume of the BigMini tablet can be calculated as:

9.84 x 6.63 x 0.36 = 22.18 cubic inches

Therefore, the new volume of the BigMini tablet would be approximately 22.18 cubic inches.

Learn more about volume

brainly.com/question/1578538

#SPJ11

A typical characteristic of debit cards is expressed by option D, they are tied directly to your bank account, since money has to be deducted for a purchase to be made.

When you use a debit card to make a purchase, the money is deducted directly from your bank account. Debit cards do not typically charge interest like credit cards do, so C is not correct.

A is also not correct since most banks do not charge a fee for using a debit card, although some may charge fees for using an out-of-network ATM or overdraft fees if you spend more than you have in your account. B is not a typical characteristic of debit cards either, as there is generally no connection between a store's loyalty program or discounts and using a debit card for payment.

Therefore, it is possible to conclude that debit cards have option D as their characteristic. Since they require money in the bank to make the purchase, they are connected to one's account.

Learn more about debit cards here:

https://brainly.com/question/30467862

#SPJ1

1. $4,076.92

2. Assets = Liabilities + Equity

3. They can be used to make online purchases.

4. by using an emergency fund for this unplanned expense

5. a fund with a minimum investment that tracks the value of cash

6. 1930s

7. Banks because they are highly regulated by the government, so the loan terms will not be predatory.

8. their vacation cabin

9. You should shop around for the best overall deal.

10. If you use a credit card, it is easy to run up huge debts.

11. They are tied directly to your bank account.

12. preventative care

13. $100,000 per person bodily injury, $300,000 per incident for bodily injury, $50,000 for property damage

14. how long the coverage lasts, how much the premium costs, and the cash value

15. 1-year renewable group term life

16. Identity thieves can intercept unencrypted data being sent to Wi-Fi hot spots.

17. Wells Fargo employees were opening unauthorized deposit and credit accounts for its customers.

18. 2 year in state community college degree

19. tuition assistance

20. -a sundae, -movie tickets

Explanation: All of these answers are correct!

Personal Finance Semester Exam

5/11/2023

The value of the limit lim x->2 | (x-2)(x+2)/(x^2-4) is undefined. This is because as x approaches 2, the denominator (x^2-4) approaches 0, which means that the fraction as a whole is undefined. Therefore, there is no value that the limit can approach.

The value of the limit lim x->2 | (x-2)(x+2)/(x^2-4) is:
Step 1: Recognize that the given expression can be simplified. Notice that the denominator, x^2 - 4, is a difference of squares, so it can be factored as (x-2)(x+2).
Step 2: Simplify the expression by canceling the common factors in the numerator and the denominator: (x-2)(x+2) / (x-2)(x+2) simplifies to 1, because the factors (x-2)(x+2) cancel each other out.
Step 3: Now that the expression is simplified, substitute x = 2 to find the value of the limit: lim x->2 | 1 = 1.
Your answer: The value of the limit lim x->2 | (x-2)(x+2)/(x^2-4) is 1.

Visit here to learn more about fractions:

brainly.com/question/10354322

#SPJ11

Answer:

30π cm

Step-by-step explanation:

if r = 15 cm

circumference = π2r

= π × 2 × 15

= 30π cm

Given points:

(u, v) = (24 + 0,u - 40, 8u): u = 3. V = 9 T, T, = n(u, v)

the equation of the tangent plane at the point (u, v) = (24, 9) is:-8x + z = -183T

Process of finding equation:

To start, let's find T..T,, which represents the magnitude of the tangent vector at the given point:

T..T, = ||n(u, v)|| = ||n(24, -31, 72)|| = ||<48, -62, 144>|| = sqrt(48^2 + (-62)^2 + 144^2) = sqrt(11668) ≈ 108.03

Next, let's find the normal vector n(u, v) at the given point:

n(u, v) =

where f_u and f_v are the partial derivatives of the surface equation with respect to u and v, respectively.

In this case, we have:

f(u, v) = (24 + 0,u - 40, 8u)
f_u = <0, 1, 8>
f_v = <1, 0, 0>

Therefore, at the point (u, v) = (24, 9), we have:

n(u, v) = <0, 1, 8> x <1, 0, 0> = <-8, 0, 1>

Finally, let's find the equation of the tangent plane at the point (u, v) = (24, 9). The equation of a plane can be written as:

Ax + By + Cz = D

where A, B, and C are the components of the normal vector, and D can be found by plugging in the coordinates of the point on the plane. In this case, we have:

A = -8
B = 0
C = 1
D = -8(24) + 1(9) = -183

Therefore, the equation of the tangent plane at the point (u, v) = (24, 9) is:

-8x + z = -183

To know more about tangent plane:

https://brainly.com/question/30260323

#SPJ11

The two terms that are commonly associated with input are input device and input data.

Input Bias are essential  factors of computer systems as they enable  druggies to interact with the machine and  give data or information that the computer processes to produce affair. There are several types of input  bias, each designed to  feed to specific  requirements and conditions. For  illustration, a keyboard is a common input device used to input  textbook and commands, while a microphone is used to input audio data.  

Input data, on the other hand, can come in  colorful forms and formats. It can be entered manually by a  stoner or automatically collected by detectors,  bias, or other systems. Input data can also be stored in  colorful  train formats,  similar as  textbook, audio,  videotape, images, or databases. It's reused by the computer system using algorithms, software programs, and  tackle  factors to  induce affair data, results, or  conduct.

Learn more about input at

https://brainly.com/question/31678836

#SPJ4