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2 years ago

12

If a diameter is 12.5 cm, what is the radius?

1 answer:

Jlenok [28]2 years ago

8 0

Answer:

6.25

Step-by-step explanation:

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A hairdresser is deciding where to open her own studio. If the hairdresser chooses Location A, she will pay $1200 per month in r

Ymorist [56]

She will need to cut 26.6 haircuts a month a location A to break even (1200/45 = 26.6) so roughly 27 haircuts to make a profit

She will need to cut 30 haircuts at location B to break even (1800/60 = 30) and 31 hair cuts to see a profit.

She will need to cut 30.67 haircuts at location A and 33 haircuts at location B to make the same profit at either location (Roughly $180).

30.67 x 45 = 1380.15 - 1200 = 180

33 x 60 = 1980 - 1800 = 180

7 0

2 years ago

Ann [662]

Answer:

look at the attachment

Step-by-step explanation:

hope it helps!

6 0

2 years ago

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Which is a graph for the inequality m<(or equal to)-2?

brilliants [131]

Answer:

cool

Step-by-step explanation:

5 0

2 years ago

A geologist examines 14 geological samples for iron concentration. The mean iron concentration for the sample data is 0.181 cc/c

kykrilka [37]

Answer:

The 90% confidence interval for the population mean iron concentration is between 0.167 cc/m³ and 0.195 cc/m³.

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:

$\alpha = \frac{1-0.9}{2} = 0.05$

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 $1-0.05 = 0.95$ , so $z = 1.645$

Now, find 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.

$M = 1.645*\frac{0.0318}{\sqrt{14}} = 0.0140$

The lower end of the interval is the sample mean subtracted by M. So it is 0.181 - 0.0140 = 0.167 cc/m³.

The upper end of the interval is the sample mean added to M. So it is 0.181 + 0.0140 = 0.195 cc/m³.

The 90% confidence interval for the population mean iron concentration is between 0.167 cc/m³ and 0.195 cc/m³.

3 0

3 years ago

Which is the best answer for the question below?

weqwewe [10]

18 is the right answer. The two fractions must be porportional

6 0

3 years ago

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