In circle P, diameter QS measures 20 centimeters.
What is the approximate length of arc QR? Round to the
nearest tenth of a centimeter
9.9 centimeters
19.9 centimeters
21.5 centimeters
43.0 centimeters
123

Use stokes' theorem to evaluate c f · dr where c is oriented counterclockwise as viewed from above. f(x, y, z) = xyi + 5zj + 7yk, c is the curve of intersection of the plane x + z = 8 and the cylinder x2 + y2 = 81.