Which number would be an element of the set of whole numbers

F(x)=|x| is shifted down 4 units and to the right 3 units.

Look at this pattern ; 1,4,9, number 10000 belongs in this pattern . what’s the place of this number?

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