1. Start with the given function: f(x) = x + 2.
2. Substitute x+7 for x in the function: f(x+7).
3. Calculate f(x+7): f(x+7) = (x+7) + 2.
4. Simplify the expression: x + 7 + 2 = x + 9.
Answer: F(x+7) = x + 9.
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Math question: In a triangle ABC, with angle A measuring 35 degrees, side a measuring 10 units, and side b measuring 15 units, find side c.