What shape is found at the coordinates(4,2)

I’m on question 7 it says a covered water tank is in the shape of a cylinder the tank has a 28 inch diameter and a height of 66 inches to the nearest square inch what is the surface area of the water tank

Lola says these two expressions have the same value. expression a expression b which explains whether lola is correct?

For the inequality |c| < |d| to be true, which of the following must be true?