A hollow insulating sphere with an inner radius of 904 cm

Question

Compute all parts of given problem:

Problem: A hollow insulating sphere with an inner radius of 9.04 cm and an outer radius of 14.7 cm has a uniform charge density of 78.7 µC/m³ distributed throughout the volume between

Part A: If we are going to use Gauss' Law to find the electric field at r = 11.18 cm, we need to know the "charge enclosed" by a surface. What "charge enclosed" should we use?

Part B: If we want to use Gauss' Law to find the electric field at r = 21.8 cm, what "charge enclosed" should we use?

Please show all work to solve the above problem.