Answer :
a)
To solve for n, we gotta take n to one side and everything else to another, like this:
[tex]\begin{gathered} C=15n+75 \\ 15n=C-75 \\ n=\frac{C-75}{15} \end{gathered}[/tex]b)
Given a budget of 225 dollars, it means C = 225.
We need to figure out n, which we already have (the formula) from part (a) above.
So, let's use that and plug in C = 225.
Thus:
[tex]\begin{gathered} n=\frac{C-75}{15} \\ n=\frac{225-75}{15} \\ n=\frac{150}{15} \\ n=10 \end{gathered}[/tex]Thus, she can take 10 campers