2 years ago

15 dollars for a book and 40 percent off

Mathematics

1 answer:

monitta2 years ago

6 0

Answer:

Step-by-step explanation:

15-40%=9

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Suppose an automotive repair company wants to determine the current percentage of customers who keep up with regular vehicle mai

Nina [5.8K]

Answer: 1692

Step-by-step explanation:

Formula to find the sample size :

$n=p(1-p)(\dfrac{z_{\alpha/2}}{E})^2$

Given : Confidence level : $(1-\alpha)=0.90$

⇒ significance level = $\alpha= 0.10$

z-value for 90% confidence interval (using z-table)= $z_{\alpha/2}=1.645$

Prior estimate of the population proportion (p) of customers who keep up with regular vehicle maintenance is unknown.

Let we take p= 0.5

Margin of error : E= 2%=0.02

Now, the required sample size will be :

$n=0.5(1-0.5)(\dfrac{1.645}{0.02})^2$

Simplify , we get

$n=(0.25)(6765.0625)=1691.265625\approx1692$

Hence, the required sample size = 1692

8 0

3 years ago

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How long a rope is required to reach from the top of a building 40 feet high 30 feet from the base of the building?

Goshia [24]

70 feet.
If you're 30 feet from the base, then you have to climb that 30 feet, plus the 40 foot length of that building. (:

7 0

3 years ago

79% of what number is 181

madreJ [45]

Answer: 1140.3

Step by step explanation:
181 x 7 = 1267
1267x0.9=1140.3

4 0

2 years ago

HELP PLEASE 26 POINTS!! please provide an explanation tooo!!!!

Mars2501 [29]

Answer:

Step-by-step explanation:

In the case of this distance, trying to imagine 5 x 10^6 is obviously way too ridiculous

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2 years ago

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Solve for the value of x:-<br> <img src="https://tex.z-dn.net/?f=4x-5%20%3D%203" id="TexFormula1" title="4x-5 = 3" alt="4x-5 = 3

enot [183]

$4x-5 = 3$

$4x = 8$

$x = 8÷4$

$x = 2$

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2 years ago

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