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beks73 [17]
2 years ago
13

15 percent of what number is 12

Mathematics
2 answers:
blagie [28]2 years ago
5 0
12÷15<u /><em />=160
you have to divide 12 by 15 percent to get the missing number  
Elden [556K]2 years ago
5 0
80
1/3 of 15= 5
1/3 of 12=4
15+5=20or 1/5
12+4=16
16=1/5
16x5=80
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The brand manager for a brand of toothpaste must plan a campaign designed to increase brand recognition. He wants to first deter
VMariaS [17]

Answer:

He must survey 123 adults.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of \pi, and a confidence level of 1-\alpha, we have the following confidence interval of proportions.

\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}

In which

z is the z-score that has a p-value of 1 - \frac{\alpha}{2}.

The margin of error is:

M = z\sqrt{\frac{\pi(1-\pi)}{n}}

Assume that a recent survey suggests that about 87​% of adults have heard of the brand.

This means that \pi = 0.87

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So \alpha = 0.1, z is the value of Z that has a p-value of 1 - \frac{0.1}{2} = 0.95, so Z = 1.645.

How many adults must he survey in order to be 90​% confident that his estimate is within five percentage points of the true population​ percentage?

This is n for which M = 0.05. So

M = z\sqrt{\frac{\pi(1-\pi)}{n}}

0.05 = 1.645\sqrt{\frac{0.87*0.13}{n}}

0.05\sqrt{n} = 1.645\sqrt{0.87*0.13}

\sqrt{n} = \frac{1.645\sqrt{0.87*0.13}}{0.05}

(\sqrt{n})^2 = (\frac{1.645\sqrt{0.87*0.13}}{0.05})^2

n = 122.4

Rounding up:

He must survey 123 adults.

6 0
2 years ago
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Answer:

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(see attached)

recall that the slope-intercept form of a linear equation is

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For this case you must simplify the expression respecting the rules of multiplication of mathematics.
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  x
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harkovskaia [24]

In three years the Marlin's truck is worth 13,440$

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The answer you're looking for is 3/5
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