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Question 1
Let C be the curve  y = 2 sqrt( x )  for 1.1 le x le 4.9.

Find the surface area of revolution about the x-axis of C.

Surface area = int_1.1^4.9 f( x ) \ dx where
f( x ) =
Now integrate to find surface area = int_1.1^4.9 f( x ) \ dx =