Show how the model in problem 7 would change if Ipl >[9. Draw the model, labeling p, q, and p + q.
Then write an addition equation using integers that
could represent p, q, and p + q.

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.