Answer:
729
Step-by-step explanation:
9 x 9 = 81
81 x 9 = 729
You didn't list the options
btw
the next step should be
(add 4 to both sides)
2y = 16
or
2y - 4 + 4 = 12 + 4
Answer:
the answer is 9 gallons its just like normal addition in math.
Step-by-step explanation: