Answer:
1395
Step-by-step explanation:
SA is the sum of all areas.
THe area of each side of the cube is 15^2 feet = 225 feet
There are 5 outwards facing sides of the cube so 225*5=1125
Each side of the triangle has an area of 1/2 *b*h, in this case, 1/2*15*9=67.5
THe triangle has four sides so 67.5*4=270
270+1125=1395
