Answer:
87.965
Step-by-step explanation:
2πrh+2πr^2
28π
The formula for calculating surface area of cylinder is 2πrh+2πr^2 (r: radius, h : height)
Since the base for the given cylinder is 2 and height is 5 the surface area would be
2π×2×5 + 2π×2^2 = 28π
2n+5=20
Subtract 5 from 5 and 20
2n=15
Divide 15 and 2 by 2
n=7.5
:P
Nothing crazy here, just a matter of figuring out the limits of integration.