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Homework Statement
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.
Homework Equations
x+9p=450
R=xp
The Attempt at a Solution
I have no idea =S. My real problem is i don't know how to write r=xp as a function of x i know it will end up being a quadratic equation i just don't know how to do it. Thanks so much for any help.