Part of the graph of the function f(x) = (x + 4)(x – 6) is shown below. Which statements about the function are true? Select two options.

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.