500/7 = 71.43 gallons per hour
950-500 = 450
450/71.43 = 6.3 more hours.
-8 and 7.
Use the quadratic formula or factor and set equal to 0.
A and E, there is honestly no really steps to find this out, you just kind of think if it makes sense like you wont divide when you want to find out how many and how many is a key word to multiplication so look for multiplication like A and E.