Help I’ll give and it’s a multiple choice it’s not that’s hard!

Look at this expression. a3b3c a-3b-3c-1 which of the following is the simplest form of the expression above?

Apositive number a or the same number a increased by 50% and then decreased by 50% of the result?

Awater tank holds 18000 gallons. how long will it take for the water level to reach 6000 gallons if the water is used at anaverage rate of 450 gallons per day