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svet-max [94.6K]
3 years ago
10

Express the following ratios in their simplest form 24:15:9

Mathematics
1 answer:
11Alexandr11 [23.1K]3 years ago
7 0
8:5:3 this is the simplest ratio
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A researcher wants to estimate the mean age of all Business Week readers at a 99% confidence level. The standard deviation of ag
Natasha2012 [34]

Answer:

A. 60

Step-by-step explanation:

We have that to find our \alpha level, that is the subtraction of 1 by the confidence interval divided by 2. So:

\alpha = \frac{1-0.99}{2} = 0.005

Now, we have to find z in the Ztable as such z has a pvalue of 1-\alpha.

So it is z with a pvalue of 1-0.005 = 0.995, so z = 2.575

Now, find the margin of error M as such

M = z*\frac{\sigma}{\sqrt{n}}

In which \sigma is the standard deviation of the population and n is the size of the sample.

We have to find:

n when M = 3, \sigma = 9. So

M = z*\frac{\sigma}{\sqrt{n}}

3 = 2.575*\frac{9}{\sqrt{n}}

3\sqrt{n} = 9*2.575

Dividing both sides by 3

\sqrt{n} = 3*2.575

(\sqrt{n})^{2} = (3*2.575)^{2}

n = 59.68

We round up, so the correct answer is:

A. 60

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4 years ago
At your first wedding event, you sold 240 To
astraxan [27]

Answer:

1.5%

Step-by-step explanation:

240=100

40=*

40 over 240 multiplied by 100%

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4355

Step-by-step explanation:

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A family pays $45 each month for cable television. The cost increases 7%.
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The initial cost is $45. To determine the increase, you need to follow two steps.

First you have to find what 7% of the original $45 is. This will tell us how much the cost will increase by.
To find 7% of $45, you need to multiply .07 x 45 = 3.15
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Next, you have to add the increase to the original cost. This will be the new monthly cost.
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Select all the equations on which the point (10, 0) lies.
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Answer:

The answer to this problem is B, C, and E.

Step-by-step explanation:

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