If f(x) = 2x and g(x) = 9x, which of the following statements is true?
OA) (gof)(x) = 18
OB) (fog)(x) = 2/3x
OC) (fog)(x) = 6/
OD) (gof)(x) = x

Composing functions means to use the output of the inner function as the input for the outer one. It gets really clear and simple if you explicitly write it out:

Now substitute :

Now, since , we know that gives as output twice the input. In this case, the input is , so the output will be twice as much:

Note that we also have

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step-by-step explanation:

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