You divide $9.20 into $395.60 and get 43 hours.
I think you left out some information. You didn't finish typing the question or a question at all. All you did was type a statement.
If there are x $13 each books and y $17 each books, then we can build the following equations:
x + y = 8 (or y = 8 - x)
13x + 17y = 128 (or y = 128/17 - 13x/17)
:)
Answer:
Can you scroll up, I cannot see the question.
Step-by-step explanation:
Scroll up and I will edit my answer