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IgorC [24]
3 years ago
7

Find the surface area. ​

Mathematics
1 answer:
Marysya12 [62]3 years ago
8 0

let's notice, this is a Cube, namely all equal sides, and mind you it has 6 sides, Check the picture below.

\stackrel{\textit{area of all 6 sides}}{6(9\cdot 9)\implies 486}

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The mean incubation time of fertilized eggs is 21 days. Suppose the incubation times are approximately normally distributed with
Korvikt [17]

Answer:

a) 20.16; b) 20.49 and 21.51

Step-by-step explanation:

We use z scores for each of these.  The formula for a z score is

z=\frac{X-\mu}{\sigma}.

For part a, we want the 20th percentile; this means we want 20% of the data to be lower than this. We find the value in the cells of the z table that are the closest to 0.20 as we can get; this is 0.2005, which corresponds with a z score of -0.84.

Using this, 21 as the mean and 1 as the standard deviation,

-0.84 = (X-21)/1

-0.84 = X-21

Add 21 to each side:

-0.84+21 = X-21+21

20.16 = X

For part b, we want the middle 39%.  This means we want 39/2 = 19.5% above the mean and 19.5% below the mean; this means we want

50-19.5 = 30.5% = 0.305 and

50+19.5 = 69.5% = 0.695.

Looking these values up in the cells of the z table, we find those exact values; 0.305 corresponds with z = -0.51 and 0.695 corresponds with z = 0.51:

-0.51 = (X-21)/1

-0.51 = X-21

Add 21 to each side:

-0.51+21 = X-21+21

20.49 = X

0.51 = (X-21)/1

0.51 = X-21

Add 21 to each side:

0.51+21 = X-21+21

21.51 = X

4 0
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SpyIntel [72]
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Sphinxa [80]

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Step-by-step explanation:

hope it helps ....

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5x-2x=7x+2x-24
3x = 9x -24
3x - 9x = -24
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3 years ago
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chubhunter [2.5K]

Answer:

1.4 or in fraction form 7/5

Step-by-step explanation:

Hope this is what you were looking for

4 0
3 years ago
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