Mrs. Ramos has 37 pictures hanging up in her classroom. She has 24 pictures in the hallway. 18 of those pictures are of students
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This is a composite. Another way to write them is f(g(x)). Take the function g(x) and stick it in for x in f(x). Like this: 
. But we aren't done cuz there's some simplifying there to do. 
and canceling out the 3's we get just a simple x as our answer. The choice is the last one above as your answer.