72000/12=6000 12 pools of equal volume, both start and end are in gallons so it's just basic division.
give each letter a number: A=1, B=2, C=3, D=4
ADD = 1+4+4=9
BAD = 2+1+4 = 7
CAD = 3+1+4 = 8
So ADA = 1+4+1 = 6
Answer:
120
Step-by-step explanation:
Answer:

Step-by-step explanation:
Given
The attached graph
Required
Calculate the constant of proportionality.
Represent the required constant with k.
Such that:

Pick any two corresponding values of x and y

This means that:

becomes

