43.5 is the answer to the question
Set up the proportion as follows:
, then cross multiply to solve.

4(24) = 6(x)
4(4) = x <em>(divided both sides by 6)</em>
16 = x
Answer: 16 ft
F(n)=9n
f(10)=9(10)
f(10)=90
f(10)=90 means that when you work 10 hours your gross pay is $90.