11. Let D be the region in the first octant that is bounded below the cone z = x2 + y and above by the sphere a2 + y + 22 =9. Express the volume of D as an iterated triple integral in the following coordinate systems. Do not evaluate the integrals. (3 points) a. cylindrical coordinates (3 points) b. spherical coordinates 12. Given the position vector T (t) = (6 sin 2t) i + (6 cos 2t)j + (5t) k. Determine the following: (4 points) a. Find T. (4 points) b. Find N. (4 points) c. Find B. (3 points) d. Find k