Answer:
s = 19
Step-by-step explanation:
Surface area of a rectangular prism is given by the formula:
S = 2lw + 2lh +2wh
Where l, w, and h are length, width and height respectively.
We are given by the picture length = 20, width = 8, the surface area = 1384, and we are solving for h (s in this case)
Using the formula and the given surface area.
1384 = 2(20×8) + 2(20×s) + 2(8×s)
1384 = 320 + 40s + 16s
1384 = 320 + 56s
1064 = 56s
s = 19
