Assignment: 
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Answer: 
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Explanation: 
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[ Step One ] Remove Parenthesis (a) = a

[ Step Two ] Simplify Equations



[ Step Three ] Rewrite Equation

[ Step Four ] Add Similar Elements

[ Step Five ] Rewrite Equation

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Translate? te podría augurar mejor
The surface area of a sphere is given by

We deduce

So, in your case, the radius is

The volume of a sphere is given by

So, we have

Im not sure what its asking.. whats the question?
Answer:
-7/15
Step-by-step explanation:
get red of the addition and subtract the two fractions