Answer:
See below
Step-by-step explanation:
Volume of cylinder ( the pool) = pi r^2 h
V = pi (12^2)(4.5) = NOTE: RADIUS not DIAMETER
2035.75 ft^3
2035.75 ft^3 * 7.48 gal / ft^3 = 15 227.42 gals
15 227.42 gal * $.02 / gal = $ 304.55 to fill
