Answer:
7
Explanation:
f(3) = x + 3x - 5
f(3) = 3 + 3(3) - 5
3 times 3 is 9
3 + 9 - 5
12 - 5 or 3 + 4
7 is your answer
f(3) = 3 + 3(3) - 5 = 3 + 9 - 5 = 12 - 5 = 7
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