A student council group is selling school posters for a p(x) = 5x−220 fundraiser. They use the function to p(x) determine their profit, in dollars, for selling $900 x school posters. In order to earn a profit of, how many school posters must they sell?
","rationale_html":"224 The correct answer is . It’s given that a student council group uses the =5 -220 function p^xh x to determine their profit p^xh, in dollars, for selling 900 x school posters. Substituting for p^xh in the given function yields 900=5 -220 220 1,120=5 x . Adding to each side of this equation yields x. 224= Dividing each side of this equation by 5 yields x. Therefore, in order to earn $900 224 a profit of , they must sell school posters. 32 SAT PRACTICE TEST #9 ANSWER EXPLANATIONS SAT ANSWER EXPLANATIONS n MATH: MODULE 1
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