PLEASE HELP!!!! YOU DON"T MULTIPLY THEM TOGETHER I ALREADY TRIED THATIf you help me and get it right I will mark brainliest and more!!!

Answer:
The surface area of this prism is 800 ft^2
Step-by-step explanation:
To get this answer you need to add all the base edges, which will equal to 40. Then you times 40 with 20 which will equal to 800 ft^2. Hope this helps!
Answer:
520ft^2
Step-by-step explanation:
triangles
A=1/2bh
A=60
since both those half triangles make one trianlge there is no need to multipply 60 by 2
back rectangular
A= l x w
A= 8x20
A= 160
face rectangle
A= l x w
A=20 x 17
bottom rectangle
A=lxw
A = 300
add it all up
60+160+300=520ft^2
LET ME KNOW IF I MADE A MISTAKE