A student council group is selling school posters for a fundraiser. They use the function p(x)...

Bluebook SAT Practice Test 9, Module 1, Question 6:

A student council group is selling school posters for a fundraiser. They use the function p(x) = 5x - 220 to determine their profit p(x), in dollars, for selling x school posters. In order to earn a profit of $900, how many school posters must they sell?

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