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2 years ago

Can y’all please help me

Mathematics

1 answer:

chubhunter [2.5K]2 years ago

8 0

Answer:

the answer is 27cm cubed

Step-by-step explanation:

formula for volume of a rectangular prism is length x width x height and 3 x 3= 9 and 9 x 3 =27

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Find the zeros of the following quadratic polynomial t square - 15

Dvinal [7]

Answer: First, write the equation,

t² - 15 = 0

Now, we shift the (-15) to RHS,

t² = 15

So, t = - √15 = -3.87 or + √15 = + 3.87

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2 years ago

An industrial psychologist consulting with a chain of music stores knows that the average number of complaints management receiv

vova2212 [387]

Answer: See explanation

Step-by-step explanation:

1. Use the five steps of hypothesis testing.

Step 1: The aim of the research is to conduct the five steps of hypothesis testing.

Step 2:

Null hypothesis: H0 u= 4

Population mean: H1 u = 4

Alternate hypothesis: u ≠ 4

Population mean: u ≠ 4

Step 3 and step 4 are attached.

Step 5: Based on the calculation, the calculated value of t is less than the t critical value, therefore, the null hypothesis will be failed to be rejected.

2. Sketch the distributions involved

This has been attached.

3. Explain the logic of what you did to a person who is familiar with hypothesis testing, but knows nothing about t tests of any kind.

The distribution is "t".

The means is tested by using T-test.

Chi-square is used to test the single variance.

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2 years ago

If the scale factor is

klemol [59]

If the scale factor is 1/5, then the area of the preimage is multiplied by 0.2 or 1/5 to calculate the area of the new image.

6 0

2 years ago

In percent, the “whole” is 100. What is the “whole” in decimal form?

tekilochka [14]

1. You divide by 100 to find the decimal version of any percentage, and do the opposite for vise versa

8 0

2 years ago

Use Hooke's Law to determine the work done by the variable force in the spring problem. A force of 450 newtons stretches a sprin

vlada-n [284]

Answer:

The work done is 202.50Nm

Step-by-step explanation:

Given

$F =450N$

$x_1 = 30cm$

$x_2 = 60cm$

Required

The work done

First, we calculate the spring constant (k)

$F = kx_1$

$450N = k *30cm$

$k = \frac{450N}{30cm}$

$k =15N/cm$

So:

$F = kx_1$

$F(x) = 15x$

The work done using Hooke's law is:

$W =\int\limits^a_b {F(x)} \, dx$

This gives:

$W =\int\limits^{60}_{30} {15x} \, dx$

Rewrite as:

$W =15\int\limits^{60}_{30} {x} \, dx$

Integrate

$W =15 \frac{x^2}{2}|\limits^{60}_{30}$

This gives:

$W =15 *\frac{60^2 - 30^2}{2}$

$W =15 *\frac{2700}{2}$

$W =15 *1350$

$W =20250N-cm$

Convert to Nm

$W =\frac{20250Nm}{100}$

$W =202.50Nm$

7 0

2 years ago