:= Instructions 1. A sales team estimates that the number of new phones they will sell is a function of the price that they set. They estimate that if they set the price at a dollars, they will sell f (x) - 5400 - 12x phones. Therefore, the company's revenue is R(x) = x(5400 - 12x) . Find the price Twhich will maximize the company's revenue. 225 275 O 325 None of the other choices is correct. O 425 2. Find the vertex of f (x) = 212 - 4x + 11. O (2, 11) O (1, 9) O (-0.5, 13.5) O (0.5, 9.5) O (-2, 27)