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College Algebra/Functions and their properties*
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Evaluating Composite Functions

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If f(x) = x3 + 4x and g(x) = 3x, what is the composite function g(f(x))?
A

x2/3 + (4/3)

B

9x3 + 12x

C

3x4 + 12x2

D

3x3 + 12x

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