The concession stand has 500 Pom-poms before the game. The fans bought them at a rate of 25 per minute what is y intercept

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.