Answer:
8
Step-by-step explanation:
f^-1(x) =dy/dx
dy/dx(8x+9)=8
32 water bottles
8x=425-175
425-175=250
250 is how much more they need.
8x=250
x=31.25
You can't have half of a bottle... so round up to at least 32 water bottles
I hope I helped you^_^
The second box to the left side
50
50 / 10 = 5
5 x 3 = 15
