The area of the base (six triangles with a base 15m and a height 7.5√3m):

The area of side walls (six triangles with a base 15m and a height 12m)

The surface area:
The answer should be:
(x-4)^2 + (y+3)^2 = 6.25
hope this helped!
The answer is 7 because add them to see the distance since it’s both positive if you count the distance it is away from zero so 3+4=7
I believe (a+b)^5 would be the answer