B 3 2. (4 points) Compute the arch length exactly. y = 4 x 3 2 - 2 x3 on [1,8] 3. (4 points) Compute the arch length exactly. y = (+2-) on [1,9] x3 6 4. (4 points) Find the surface area of the volume formed by revolving the graph of y =x on [1,9] about the x-axis. 5. (4 points) Find the surface area of the volume formed by revolving the graph of y = + 8 5 6. (4 points) Find the surface area of the volume formed by revolving the graph of y 1 4x on [1,6] about the x-axis. X 5 + e 5 on [0, 5], about the