Exercise 16-3 Static Consider the estimated quadratic model y = 20 + 1.9x - 0.05x2. a. Predict y when x equals 10, 20, and 30. (Round intermediate calculations to at least 4 decimal places and final answers to a whole number.) Predicted y For x = 10 For x = 20 For x = 30 b. Find the value of x at which the predicted y is optimized. At this x value, is the predicted y maximized or minimized. (Round intermediate calculations to at least 4 decimal places and final answer to a whole number.) At x = the predicted y is