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3 years ago

Whats 15= -15 - 8u equals to?

Mathematics

1 answer:

Nostrana [21]3 years ago

4 0

Method

15 = - 15 - 8u Add 15 to both sides.

15 + 15 = - 15 + 15 - 8u. This step is meant to get rid of -15 on the right side.

30 = -8u Divide both sides by 8

30 / -8 = u

Note

Usually what you are trying to do is reduce an equation so that it tells you what 1 of the letters is. Since there are many things u could be, you have to choose the one that best fits your answer

u = - 3 6/8

u = - 3 3/4

u = - 3.75

u = - 30/8

u = - 15 / 4

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antiseptic1488 [7]

Answer:

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2 years ago

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3 years ago

In analyzing the city and highway fuel efficiencies of many cars and trucks, the mean difference in fuel efficiencies for the 60

Olegator [25]

Answer:

$7.38-1.96\frac{2.51}{\sqrt{601}}=7.18$

$7.38+1.96\frac{2.51}{\sqrt{601}}=7.58$

For this case the confidence interval is given by :

$7.18 \leq \mu \leq 7.58$

Step-by-step explanation:

Data provided

$\bar X=7.38$ represent the sample mean for the fuel efficiencies

$\mu$ population mean

s=2.51 represent the sample standard deviation

n=601 represent the sample size

Confidence interval

The formula for the confidence interval of the true mean is given by:

$\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}$ (1)

The degrees of freedom for this case is given by:

$df=n-1=601-1=600$

The Confidence level for this case is 0.95 or 95%, and the significance level $\alpha=0.05$ and $\alpha/2 =0.025$ and the critical value is given by $t_{\alpha/2}=1.96$