Got these questions on a practice quiz and am a bit confused with them. I can do any other of these but these three leave me confused. Assistence is appreciated!

1. Find the total surface area of the following figure. (it gives a hint saying "The surface area formula for the cone includes the base of the cone. Substract this value."

2. Find the total surface area of the following figure. The back of the figure is a rectangle. Disregard the bottom of the figure.

3. The total surface area of a sphere is 100 pie in 2. Find the radius.

Thank you in advance!