So your number is z and you want 9 less z-9
You make 2 2/7 an improper fraction (16/7) and then you subtract 8/7 from 16/7 and you get 1 1/7 (or 8/7) as your final answer
The office must buy 6 5- gallons jugs each month for Best Water to cost less.
8x - 16y = a common factor would be 8...so factor out 8
8(x - 2y)
