Simplify completely. 3(y - 8) + 4y a) 7y - 8 b) 7y^2 - 24 c) 7y - 24 d) the expression cannot be simplified.

The median am of triangle ∆abc is half the length of the side towards which it is drawn, bc . prove that triangle ∆abc is a right triangle, and find angle mac and abm