Yvaries directly as x. if x = 5 when y = 12 find x when y = 30

Direct Variation. The equation is y=k(x). So 12=k(5), divide by 5 on both sides coming up with k=2.4. Plug 2.4 in as k in the original equation, making it 30=2.4(x), divide both sides by 2.4, 30 divided by 2.4 is 12.5, making x=12.5

Answer d; a supplementary angle = 180°, so if that angle = 150°, y would = 30°.