Math question need help?????

Posted on 2015-09-16 05:57:00 in Math by RYAN

In a class of 120 students, everybody would take two hamburgers if the price were zero, and no one would
buy hamburgers if the price were $4 or more.
Assume that the class’s demand curve for hamburgers is linear, and give a formula
(a) (3 pts) describing quantity as a function of price
(b) (3 pts) describing price as a function of quantity
(c) (3 pts) Total revenue is a function of quantity and can be computed by R = price ×quantity. Find the total
revenue function corresponding to the demand curve, and conclude that it is quadratic.
(d) (3 pts) At what value does its maximum or minimum occur? (Use the technique of completing the square.)

I just need help with c) and d), the others are just there for background. For c) specifically can you provide detailed steps? thanks

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