The function p(x) = –2(x – 9)2 + 100 is used to determine the profit on T-shirts sold for x dollars. What would the profit from sales be if the price of the T-shirts were $15 apiece?

Substitute the T-shirt price, x = 15, into the function: p(15) = −2(15 − 9)² + 100. Since 15 − 9 = 6, the profit is −2(36) + 100 = −72 + 100 = $28. The correct choice is $28.

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