Answer:
I think it goes like this:
4x+5x=180
9x=180
x=180:9
x=20
Step-by-step explanation:
Let h be the numbers of hours, f be the one-time fee and c the cost charged. The equation is

Since you pay $15 per four, plus the fee. We can solve this equation for the fee:

If we plug c=195 and h=9, we have

The answer is 9/16
there are two ways you can get this
take 3/4 times 3/4 to get 9/16
or
3/4 of an hour = 45 min and 3/4 of 45 min = 33.75 min and 33.75/60(minutes in an hour) = 9/16
None of the choices are correct
416=80 + 4b
b=books
subtract 80 from both sides
416-80 = 80-80+4b
336=4b now divide both sides by 4
336/4=4b/4
84=b
he can buy 84 books at the max