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Tanya [424]
3 years ago
11

Given the function y = -2ex , find y if x = 3.

Mathematics
1 answer:
Solnce55 [7]3 years ago
5 0

Answer:

Assuming function is y=-2*e*x: y(3)= -16.31.

Assuming function is e^xy=-2*e^x: y(3)= -40.17

Step-by-step explanation:

These should both be simple enough to do with a calculator or simply googling, but if you must do it by hand, an easy trick to remember is that e is approximately equal to 2.718 so substitute that value wherever you see e. Then, just substitute 3 in for x and simply multiply.

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Answer:

The 90% confidence interval for the mean combined fuel economy for Ford Explorers is between 22.95 and 23.63 mpg.

Step-by-step explanation:

We have the standard deviation for the sample, which means that the t-distribution is used to solve this question.

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 = 16 - 1 = 15

90% confidence interval

Now, we have to find a value of T, which is found looking at the t table, with 15 degrees of freedom(y-axis) and a confidence level of 1 - \frac{1 - 0.9}{2} = 0.95. So we have T = 1.7531

The margin of error is:

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The upper end of the interval is the sample mean added to M. So it is 23.29 + 0.34 = 23.63 mpg

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