Percentage (use ratio to solve)

[ydjgdi3]

When a metal sphere expands under heating, its surface area increases by 14.49%.

a) Find the percentage change in the diameter of the metal sphere.

b) Find the percentage change in the volume of the metal sphere.

 

[firemath]

Do you know the formula for those two measurements of a sphere?
If you do, use the percent of surface area that you have and work backward.

 

[Steven G]

What is the formula for the surface area of a sphere? What has to change for the surface area to increase by 14.49%?