if P Q and R are the angles of triangle pqr are then prove that 2 (SinA/2 + sinR /2) (sinQ/2 - sin/2x ) - cosP = 1- 4 cosP/2 cosQ/2 sinR/2​

I've never been good at math he told he loves but he keeps cheating on me, so it ain't adding up sis

For problems 29 - 31 the graph of a quadratic function y=ax^2 + bx + c is shown. tell whether the discriminant of ax^2 + bx + c = 0 is positive, negative, or zero.

Jake bakes and sell apple pies. he sells each pie for $5.75 . the materials to make the pies cost $40. the boxes jake puts the pies in cost & 12.50 total. how many pies does jake need to sell to earn a profit of $50