If the length of the long paper roll is 11 1/4 inches, what is the length of each short paper roll?

What is r i 4.5+10r=-6.5 with work pls

Using elimination, what is -4x+2y=-12 4x+8y=-24

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.