SOLUTION: given g(a) = a-3 ; f(a) = 3a, evaluate (g o f ) (4)

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Question 1170919: given g(a) = a-3 ; f(a) = 3a, evaluate (g o f ) (4)
Answer by MathLover1(20850) About Me  (Show Source):
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given:
g%28a%29+=+a-3+
f%28a%29+=+3a
evaluate
(g o +f ) (4)
first find
(g o +f ) (a)=g%28f%28a%29%29
(g o +f ) (a)=g%283a%29
(g o +f ) (a)=3a-3

now substitute a=4
(g o +f ) (4)=3%2A4-3
(g o +f ) (4)=9