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Advocard [28]
3 years ago
5

I NEED HELP Which ordered pair is a solution of the equation?

Mathematics
2 answers:
Sever21 [200]3 years ago
5 0

Answer:

its c

Step-by-step explanation:

both a and b make 17 !!!

allochka39001 [22]3 years ago
5 0

Answer:

C. Both

Step-by-step explanation:

Substitute the first number for x and the second number for y. See if they solve the equation.

Try (10,1)

x+7y=17

10+7(1)=17

17=17 so (10, 1) works

Try (-4,3)

x+7y=17

-4+7(3)=17

-4+21=17

17=17 so (-4,3) works too!

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A news report states that the 99% confidence interval for the mean number of daily calories consumed by participants in a medica
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Answer:

The sample mean is of 1925 calories.

The margin of error is of 75 calories.

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Step-by-step explanation:

Sample mean:

The sample mean is the mean value of the two bounds of the confidence interval. So

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The margin of error

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The margin of error is of 75 calories.

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Here, I am going to expand on the t-distribution.

The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So

df = 18 - 1 = 17

99% confidence interval

Now, we have to find a value of T, which is found looking at the t table, with 17 degrees of freedom(y-axis) and a confidence level of 1 - \frac{1 - 0.99}{2} = 0.995. So we have T = 2.898

The margin of error is:

M = T\frac{s}{\sqrt{n}}

In which s is the standard deviation of the sample and n is the size of the sample.

Since M = 75, T = 2.898, n = 18

M = T\frac{s}{\sqrt{n}}

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s = \frac{75\sqrt{18}}{2.898}

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