please answer all questions

a For the following exercises, find the surface area of the volume generated when the following curves revolve around the x-axis. If you cannot evaluate the integral exactly, use your calculator to approximate it. 191. y = x from x = 2 to x = 6 192. y = x' from x = 0 to x = 1 193. y = 7x from x = -1 to x = 1 194. y = 1 x 2 from x = 1 to x = 3 195. y = V4 - x2 from x = 0 to x = 2