Step-by-step explanation:
Surface area of a square pyramid is the area of the square base plus the area of the four triangles made from the base and the slant height.
SA = s² + 4(sh/2)
which reduces to:
SA = s² + 2sh
You are told that s = 11 and SA = 319. You can now solve for h:
319 = 11² + 2(11)h
319 = 121 + 22h
198 = 22h
h = 9 ft (answer C)
I hope it's helpful!!
The answer is 4,172
First of all i did 490x9=2880
Then i did 2880+1292=4172
4172
-3n+48=0
-3n=-48
-3n/-3 & -48/-3
n=16