13. find the surface area of each figure to the nearest tenth.

Check the picture below.

so, notice, the prism is really just 6 rectangles stacked  up to each other at the edges.

front and back, two rectangles of 11x6

left and right, two rectangles of 5x6

top and bottom, two rectangles of 11x5

get the area of all 6, and sum them up, and that's the area of the prism.

It is 94.7% that uses the metric system