Answer:
4x2+9-12x
Step-by-step explanation:
it may help you to understand
We can parameterize this part of the cylinder using

with

and

. Then the surface element is


so the area is given by the surface integral, where

denotes the part of the cylinder in question,

Probably less work would involve a simpler geometric approach, but it doesn't hurt to practice setting up a proper surface integral.
Basically all you need to do is estimate what 32.7 x 2.8 is. If what you get is close to 91.56, then Tom's answer is reasonable. If what you get is not close to 91.56, then his answer is not reasonable. Do you know how to estimate by rounding?
Assuming that you were to simplify this, you'd get 2n + 7n + 8 = 9n + 8.
error_code- 67584598379432332