Originally Posted by

**bobchiba** Hi, I thought this should go into college level, really sorry if you guys think its at more of a high school level. Anyways...

Ive got his really long drawn out problem, and 2 people i usually get to help me have given me conflicting solutions.....

anyway, ive simplified the example to pure maths and done away with all the, "this train arrives at".......etc etc........ here goes

If C = 500 + 10X - X^2

R = 150X - 4X^2

P = C - R

show that P = -3X^2 + 140X - 500

then Im supposed to represent the graph of P against X