Writing Composite Functions (Word Problem)

hatjuice

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Joined
Apr 19, 2014
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I know how to write composite functions, but then when I try to solve the word problems that go with them I get stuck; with this particular one I have probably spent the past 20 minutes trying to solve it. My final answer doesn't seem very reasonable. Help?

Thank you very much in advance! My final answer is circled in blue.

(Instead of using c, I used x instead)
 

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