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Zielflug [23.3K]
3 years ago
15

Select the closest answer. *

Mathematics
1 answer:
Eduardwww [97]3 years ago
8 0

Answer:

D. 221.7 cm

Step-by-step explanation:

Surface area of a sphere is: SA=4\pi r^2

'r' - radius

We are given the radius of 4.2 centimetres.

SA=4\pi 4.2^2\\4 * \pi * 4.2^2\\\rightarrow 4.2^2 =17.64\\\text {Using 3.14 for pi: }\\4 * 3.14 *17.64\\12.56*17.64\\\boxed {221.5584}

221.5584 ≈ 221.6

The closest answer is Option D, therefore it should be the correct answer.

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You forgot to say what the question actually is ! 

But  I've seen this problem before, in the last few days, here on Brainly. 
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I'll slog through that, and I'll try to explain what I'm doing clearly enough
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1).  Solve the equation for 'a'.  That means you have to wind up with something
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========================

2).  Solve the equation for 'b'.  That means you have to wind up with something
that says      b = everything else.

<u>D = (a + b + c) / c</u>

Split the right side into 3 fractions:      D = a/c + b/c + c/c

But  c/c =1 ,  so the equation says      D = a/c + b/c + 1

Subtract  (a/c +1)  from each side:      D - a/c - 1  =  b/c

Multiply each side by 'c' :                  <em>Dc - a - c  =  b</em>
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Divide each side by  (D - 1) :      <em>c  =  (a + b) / (D - 1)</em> 
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