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Nesterboy [21]
3 years ago
9

Let n = 13. What is the value of 25 + 2n?

Mathematics
2 answers:
Lostsunrise [7]3 years ago
8 0
The answer for this is 51
25 + 2•13
25 + 26
51
maxonik [38]3 years ago
4 0
So you do 2 times 13 cause your substituting the N.than add 25.i got 51 but you can resolve to make sure im right.
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<h2><u>Answer with explanation</u>:</h2>

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Alternative hypothesis : H_a : \mu

Since H_a is left-tailed and population standard deviation is known, thus we should perform left-tailed z-test.

Test statistic : z=\dfrac{\overlien{x}-\mu}{\dfrac{\sigma}{\sqrt{n}}}

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For n= 31,\ \sigma=8000,\ \overline{x}=46,800\ \&\ s=46,800, we have

z=\dfrac{46800-50000}{\dfrac{8000}{\sqrt{31}}}=-2.23

By using z-value table,

P-value for left tailed test : P(z≤-2.23)=1-P(z<2.23)   [∵P(Z≤-z)=1-P(Z≤z)]

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[We reject the null hypothesis when p-value is less than the significance level .]

Conclusion : We do not have enough evidence at 0.05 significance level to support the claim that t its deluxe tire averages at least 50,000 miles before it needs to be replaced.

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Answer: b=4


Step-by-step explanation: Let's solve your equation step-by-step.

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Step 1: Simplify both sides of the equation.

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Step 2: Subtract 5b from both sides.

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Step 3: Subtract 5 from both sides.

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Step 4: Divide both sides by -1.

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