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Find the area of the surface generated when the given curve is revolved about the given axis. Find the area of the surface generated when the given curve is revolved about the given axis. y = X 16 for 0 x5 4; about the x-axis 30 y= 18 ( X + e - 8x), for - 5sx5; about the x-axis The surface area is square units. (Type an exact answer, using it as needed.) The surface area is square units. (Type an exact answer, using It as needed.)