Answer:
f(7) = 68
Explanation:
We are trying to find when x = 7, so we should substitute it in the equation.
f(7) = 9(7) + 5
f(7) = 63 + 5
f(x) = 9x + 5
Let x = 7
f(7) = 9*7+5
= 63+5
= 68
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