A 10-nc point charge is located at the center of a thin

Question

Compute each part of given question:

Question: A 10-nC point charge is located at the center of a thin spherical shell of radius 8.0 cm carrying -20 nC distributed uniformly over its surface.

Part A: What is the magnitude of the electric field 2.0 cm from the point charge?

Part B: What is the magnitude of the electric field 6.0 cm from the point charge?

Part C: What is the magnitude of the electric field 15 cm from the point charge?

I don't just need an answer, work and explanations/walkthrough would be much appreciated for above question! Thanks.