Can you me with these 5 questions?

1.

Use the formula for the surface area of a sphere:



Plug in what we know:



Simplify the exponent:



Multiply:



This is an exact answer, if you want an approximate answer you can input 3.14 for pi:



2.

Use the formula for the volume of a sphere:



Plug in what we know:



Simplify the exponent:



Multiply:

 

This is an exact answer, if you want an approximate answer you can plug in 3.14 for pi:



3.

Since the two figures are similar, the ratio of their sides must be equal. So we can set up a proportion:



Cross multiply:





Divide 9 to both sides: