Answer:
448 square feet.
Explanation:
First off lets calculate the required wallpaper for the two walls which have lengths 15 ft, 15*8*2=240 is the answer as 8 and there are 2 walls so we multiply by 2 then we calculate the other 2 walls with lengths 13 ft, 13*8*2=208 then we finally add them 240+208=448.