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9-45.

Substitute
(3 + h) for every 'x' in the 'f' function. Simplify.

20xh + 10h2

Substitute (20+h) for every 'x' in the 'g' function. Simplify.

Substitute
(15 − 3x) for every 'x' in the 'f' function. Simplify.

2250 − 900x + 90x2