A retatiler of boom boxes knows that at a price of p dollars, he can sell 900-3p boom boxes per month. Write a polynomial, and how many could be sold for 200 and 300 dollars.

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Let s = how many could be sold. Your function is s = 900 - 3p. Now, let p = 200 and then p = 300 in the function. Solve for s separately. Can you take it from here? Keep in mind that p = the money = the price.