Question

Marisa is decorating a rectangular prism with a height of 2 ft, width of 1 ft, and length of 3 ft. Each tile costs $0.79. How much will it cost Marisa to tile the outside of the whole prism?

Answer 1

how big are the tiles?

Answer 2

let's assume tiles of 1ft square. That means there are
2(2*1+2*3+1*3) = 2(2+6+3) = 2*11 = 22 tiles
now just multiply that by the cost of a single tile.

If the tiles are smaller, then adjust the number accordingly