A circles equation is
(x – h)^2 + (y – k)^2 = r^2
The center is at the point (h, k)
The radius is r.
Your circles equation is:
(x – 2)^2 + (y – 8)^2 = 5^2
Because the account is compounded continuously, Euler number is required
e = 2.7182818

now, a line perpendicular to that one, will have a "negative reciprocal" slope, thus
Answer:
7.2 gallons
Step-by-step explanation: