Find the inverse function y=x-2

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Which expressions equal 9 when x=4 and y=1/3 a. x2+6y b. 2x + 3y c. y2-21x d. 5 (x/2) -3y e. 3x-9y

Use the quadratic function to predict f(x) if x equals 8. f(x) = 25x2 − 28x + 585