What is the equation

12 out of 30 people chose their favourite colour as blue caculate the angle you would use for blue on a pie chart

Find y to the nearest hundreds place

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.