1. The problem statement, all variables and given/known data The Demand Equation for a certian product can be modeled by x+9p=450. Use this to rewrite the revenue equation R=xp as a function of x. Find the number of goods that will maximize profit. Find the maximum profit. 2. Relevant equations x+9p=450 R=xp 3. The attempt at a solution I have no idea =S. My real problem is i dont know how to write r=xp as a function of x i know it will end up being a quadratic equation i just dont know how to do it. Thanks so much for any help.