I need to figure out these questions.

1. The total surface area of a rectangular polyhedron is 216 in^{2}. If the length and width are 10 and 6 inches respectively, find the height.

2. The total surface area of a cone is 14 cm^{2}. If the radius is 2 cm, find the slant height.

3. The total surface area of a sphere is 64in^{2}. Find the radius.

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