Please answer last three subparts asap.. and don't give handwritten answer ..thanku

The differential equation (5y - 2x)y' - 2y = 0 is a) Exact b) Non-exact The differential equation xy dx + (2x2 + 3y2 - 20)dy = 0 is a) Exact b) Non-exact The differential equation (x + 3y?)dx + 2xy dy = 0 is a) Exact b) Non-exact The differential equation (sin y + x2 + 2x)dx = cosy dy is a) Exact b) Non-exact The differential equation (y + 2x)dx + x(y + x + 1)dy =0 is a) Exact b) Non-exact The integrating factor to reduce the differential equation xy dx + (2x2 + 3y2 - 20)dy = 0 to exact differential equation a) y's b) y2 c) y d) None of these