The correct answer is: Option 3: 
Step-by-step explanation:
Given

We have to find

This will be equal to:

So we have to find the composition of (fog)(x) first

Now,

The correct answer is: Option 3: 
Keywords: Composition, Functions
Learn more about function composition at:
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Don’t know if there’s much of an equation for it, but I guess the best way to write it out is 10 + x = -18. Then, you would subtract the 10 from both sides in order to isolate the x. So then you’re left with x = -28. So -28 is your answer.
40 dollars per 5 students=9 dollars per 1 student
divide both sides by 5.