Question

Help!!!!! please!!!!!

Answer 1

Answer:

The answer is option b.

144π

Step-by-step explanation:

Surface area of a sphere is 4πr²

where r is the radius

diameter = radius / 2

For Big sphere

radius = 15 / 2 = 7.5in

Surface area = 4π(7.5)²

= 225π

Small sphere

radius = 9/2 = 4.5in

Surface area = 4π(4.5)²

= 81π

Difference of the surface areas is

Surface area of big sphere - surface area of small sphere

Which is

225π - 81π

= 144π

Hope this helps you.