Answer: 26 gallons.
390÷15
15 can go into 39 only 2 times.
39-30 is 9
15 can go into 90 only 6 times.
90-90 is 0.
The formula for exponential decay is

where a is the initial value (28750)
r is the rate of decrease (0.12)
x is the time, in this case in years (6 . 2018-2012 = 6 years)

<span>y </span>≈ <span>13351.62</span>
Answer : C
6 2 over 3 units
Sum of a number and 7 = x + 7
Is 11 = "= 11"
That equals x + 7 = 11.
x = 4
Hope this helped☺☺