For questions 8, 9, 10: Note that r2 + y² = 12 is the equation of a circle of radius 1. Solving for y we have y=√1-2, when y is positive. 8. Compute the length of the curve y-v1- between x = 0 and z = 1 (part of a circle.) 9. Compute the surface of revolution of y = √1-² around the z-axis between z = 0 and x = 1 (part of a sphere.) 10. Compute the volume of the region obtain by revolution of y = √1-² around the z-axis between r = 0 and z = 1 (part of a ball.)