Question: Consider the estimated quadratic model y = 20 + 1.9x 0.05x 2 . a. Predict y when x equals 10, 20, and 30. b.

Consider the estimated quadratic model

ŷ = 20 + 1.9x − 0.05x2.

a. Predict y when x equals 10, 20, and 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?

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