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Greeley [361]
3 years ago
15

Paul left for school at 7:25 AM. He returned home at 3:15 PM. How long was Paul away from home?

Mathematics
1 answer:
Nikitich [7]3 years ago
7 0

7.25 until 8.00 = 35 minutes

8.00 until 3.00 PM =  7 hours

3.00 until 3.15 = 15 minutes

Answer is 7 hours 50 minutes

You might be interested in
Charlotte needs to collect at least 5,000 signatures for her petition. She has already collected 3,187 signatures. Write and sol
Feliz [49]

Okay!

The most important part of this problem is knowing which inequality sign to use

Greater than >

Less Than  <

Equal to .. =

Greater or equal to ≥

Less than or equal to  ≤

Charlotte needs AT LEAST 5,000 votes, meaning she has to have 5,000 votes <u>or more </u>

That means we use this sign →  ≤

Now lets set up an equation to find how many more we need

5,000  ≤  3,187 + X

solve for X

1,813 ≤ X

Hope I helped :) Sorry for the long explanation

5 0
3 years ago
What is the volume of the composite
vladimir2022 [97]
The sum of the volume of its part
5 0
1 year ago
A study was conducted to determine whether magnets were effective in treating pain. The values represent measurements of pain us
Zanzabum

Answer:

Step-by-step explanation:

Hello!

The objective of the study is to determine whether the magnets are effective in treating pain. For these two independent groups of individuals with equal affections were randomly sampled, one was treated with magnets and the other group of individuals, call it control group, was treated with a placebo treatment.

The information for both samples is:

X₁: pain measurement using a visual analog scale after the individual received magnet treatments.

X₁~N(μ₁;σ₁²)

n₁= 20

X[bar]₁= 0.46

S₁= 0.93

X₂: pain measurement using a visual analog scale of an individual of the control groups.

X₂~N(μ₂;σ₂²)

n₂= 20

X[bar]₂= 0.41

S₂= 1.26

The claim is that the pain reductions of the control group have more variation than the pain reductions of the target group. If it's so then we could suspect that the population variance of the control group, σ₂², will be greater than the population variance of the magnet group, σ₁².

To test the relationship between these two population variances you have to conduct a variance ratio test using the Snedecors F statistic.

The hypotheses are:

H₀: σ₂² ≤ σ₁²

H₁: σ₂² > σ₁²

α: 0.05

F= (\frac{S_2^2}{S_1^2}) * (\frac{Sigma_2^2}{Sigma_1^2} )~~ F_{(n_2-1);(n_1-1)}

This hypothesis test is one-tailed to the right, there is only one critical value:

F_{(n_2-1);(n_1-1); 1 - \alpha } = F_{19;19; 0.95}= 2.17

The decision rule for the test is:

If F_{H_0} ≥ 2.17, then the decision is to reject the null hypothesis.

If F_{H_0} < 2.17, then the decision is to not reject the null hypothesis.

F_{H_0}= \frac{S_2^2}{S_1^2}*\frac{Sigma_2^2}{Sigma_1^2}  = \frac{(1.26)^2}{(0.93)^2} * 1

F_{H_0} = 1.835 = 1.84

Since the calculated value of F is less than the critical value, the decision is to reject the null hypothesis. So using a 5% significance level the decision is to not reject the null hypothesis, you can conclude that the population variance of the pain reduction of the control group is less or equal than the population variance of the pain reduction on individuals treated with magnets.

I hope it helps!

3 0
3 years ago
Which one is right ?
sergey [27]

Answer:

6/10

Step-by-step explanation:

all can be reduced to 2/5, except 6/10:

2/5

8/20=2/5   (divide out 4)

12/30=2/5 (divide out 6)

but not

6/10 = 3/5!


7 0
3 years ago
What is 6divided by 2(1+2)
Aloiza [94]

Answer: 1

Step-by-step explanation:

6/2(1+2)

6/2(3)

6/6

1

7 0
2 years ago
Read 2 more answers
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