The table shows number of gallons of water w in the swimming pool after

120 gallons

Step-by-step explanation:

when we put gallons wait will be 120

360 gallons

Step-by-step explanation:

well we know that we start with 30 gallons and the rate of change still seems to be 30/1 or 30 so i did this the easy way and did 30 gallons times 12 minutes which equals 360 gallons for 12 minutes.

or

step-by-step explanation:

we need to solve for 'x' the following equation:  

we have that:

⇒

⇒ ⇒

factorizing, we get that:

  ⇒

then, the solutions are: or

nothing extraneous has been found!