What is the answer to this equation:

23 x a = 10189
what is a?

Alarge rectangle is divided into four smaller rectangles.

Can someone me with this problem . show your work .

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.