Question

The following function shows the relationship between the selling prices, and profit P(s), in dollars, for a company: P(s) = -20s2 + 1,400s - 12,000 Which statement best describes the intervals where the company's profit increases, decreases, or records a maximum? It is least when the selling price is $30. It is greatest when the selling price is $30. It decreases when the selling price increases from $10 to $35. It increases when the selling price increases from $10 to $35.