1 year ago

Show that the expression 3b - 4 + 6(b-9) is equivalent to the expression 9(b-6) – 4

Mathematics

1 answer:

Bad White [126]1 year ago

3 0

Step-by-step explanation:

comment me if the answer is correct in the image above

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Suppose bananas, b, cost 0.29 each. Write an expression for the cost of buying a certain quantity of bananas. No spaces in the q

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In a random sample of fivefive microwave ovens, the mean repair cost was $75.0075.00 and the standard deviation was $13.0013.

Radda [10]

<h2>Answer with explanation:</h2>

As per given , we have

Sample size : n= 5

Degree pf freedom = : df= 5-1=4

$\mu=\$75.00$

$\sigma=\$13.00$

Significance level for 90% confidence = $\alpha=1-0.90=0.1$

Using t-value table , t-critical value for 90% confidence:

$t_{\alpha/2, df}=t_{0.05, 4}=2.132.$

Margin of error of $\mu$ : $E=t_{\alpha/2}\dfrac{\sigma}{\sqrt{n}}\\\\(2.132)\dfrac{13}{\sqrt{5}}=12.3949720129\approx12.39$

Interpretation : The repair cost will be within $12.39 of the real population mean value $\mu$ 90% of the time.

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2 years ago

Show that the expression 3b - 4 + 6(b-9) is equivalent to the expression 9(b-6) – 4​

Show that the expression 3b - 4 + 6(b-9) is equivalent to the expression 9(b-6) – 4