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3 years ago

Please help me please

Mathematics

1 answer:

Lemur [1.5K]3 years ago

4 0

Answer:

The answer would be "j"

Step-by-step explanation:

First, you would want to find the value of the original equation:

5(y + 2) + 4

Use order of operations and distribute the five.

5y + 10 + 4

5y +14

This is the value of the original equation

Now we can work through the other options, but because we already know the answer, lets see about that one.

5 x y + 5 x 2 + 4

Again, use order of operations.

Multiply first

5y + 10 + 4

and complete the equation

5y + 14, which equals our original equation.

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Given that Janelle travels at 65 mph. the number of more hours it will

take her to reach her destination is approximately 5 hours.

<h3>How can the time to reach her destination be calculated?</h3>

Possible part of the question that appear missing are;

The distance Janelle drove in 4 hours = 260 miles

The distance from which she started = 575 miles

Required:

The number of extra hours it will take her to reach her destination

Solution:

The remaining distance = 575 miles - 260 miles = 315 miles

$Speed = \mathbf{ \dfrac{Distance}{Time}}$

$Janelle's \ average \ speed = \dfrac{260 \, miles }{4 \, hours} = \mathbf{ 65 \, mph}$

$Time = \dfrac{Distance}{Speed}$

Which gives;

$Time \ to \ reach \ her \ destination = \dfrac{315 \, miles}{65 \, mph} = 4\frac{11}{13} \, hours \approx \mathbf{ 5 \, hours}$

The time it takes Janelle to reach her destination ≈<u> 5 hours</u>

Learn more about average speed during motion here:

brainly.com/question/11241290

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2 years ago

A researcher wants to estimate the mean number of hours per day that elementary aged school children spend watching TV in order

Mashutka [201]

Answer:

a) The confidence interval (1.93, 4.25) means that there is 95% confidence that the population mean for the number of hours per day spent watching TV is within 1.93 and 4.25.

b) H0: μ=2.5. The null hypothesis failed to be rejected.

H0: μ=1.2. The null hypothesis is rejected.

Step-by-step explanation:

a) The confidence interval (1.93, 4.25) means that there is 95% confidence that the population mean for the number of hours per day spent watching TV is within 1.93 and 4.25.

b) If a two-sided hypthesis test is performed at a significance level of 0.05 with a null hypothesis H0: μ=2.5, the result would be that the null hypothesis failed to be rejected.

This is because we have the information of the 95% confidence level, that has the same level of significance and is also two-sided, includes the value 2.5. The confidence interval is, in this case, equivalent to the acceptance region for the hypothesis test, so the null hypothesis failed to be rejected.

If the null hypothesis mean would have fallen outside of the limits of the confidecence interval, the null hypothesis would have been rejected.

This is the case of H0: μ=1.2, which lies outside the confidence interval (in the rejection region). Then, the null hypothesis is rejected.

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3 years ago

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Answer:

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Step-by-step explanation:

Using the formula given

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n = 5

∑(x-x⁻)² = 34

Therefore;

s = √(1/5(34)

= √6.8

<u> = 2.6 </u>

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