Answer: A. profit of $4500
Explanation:
 r(x) = x² + 6x + 10
 - c(x) = x² - 4x + 5
(r - c)(x) = 10x + 5
(r - c)(4) = 10(4) + 5
 = 40 + 5
 = 45
(r - c)(x) represents the profit (in hundreds of dollars) in x months
(r - c)(4) represents the profit (in hundreds of dollars) in 4 months
So, the new store will have a profit of $4500 in 4 months