Answer:
f(15) = 49
Explanation:
f(x) = 4x - 11
f(15) = 4(15) - 11 (substitute 15 instead of x)
f(15) = 60 -11
f(5)=9
f(x)=4x-11
f(5)=4(5)-11
= 20-11
=9
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