1. 52.5 gallons per person per day day
Gallons used divided by amount of people. 6300/4 = 1575 gallons per month
so 1575 divided by 30 = 52.5
2a. In 1980 population used 117232500 gallons per day
Using the answer from the previous question multiplied by the amount of people in Atlanta in 1980. 52.5*2,233,000 = 117232500
2b. In 2000 population used 215890395 gallons per day
Similar to the last question 52.5*4112198 = 215890395
2c. 98657895 is the difference.
Difference means to find the difference this question is referring to those two numbers (2a and 2b), otherwise know as subtraction. So subtract the two numbers by each other, that's the difference. The difference is rarely written as negative so make sure to put a positive answer. 215890395 - 117232500 = 98657895