3 Question #1 Find the surface area generated when y = 162 + 1 from x = l to x = 2 is x rotated around the x axis Question #2 Find the area of the surface of a sphere of radius r, which is generated when rotating a semicircle centered at the origin, is rotated about its diameter. Question #3 - If a spring is stretched 4m form its starting length when 20n of force is applied, then how much work (in Joules) is done by the spring when it is stretched 10 m? (1.5 point)