Question

Alex needs to buy compressed air to fill empty cylindrical tanks for his tire store. Each tank is 12 feet deep and has a radius of 6 feet. What is the volume of compressed air needed to fill 5 tanks? (Use 3.14 for π.)
A. 565.2 ft3

B. 1,356.5 ft3

C. 3,452.6 ft3

D. 6,782.4 ft3

Answer 1

So
volume=height times area of base
base =circle so
area of base=area of circle=pir^2
volume=h(pi)r^2
h=12
r=6
pi=3.14 aprox
subsitute
volume=12(3.14)6^2
volume=12(3.14)36
volume=1356.48
that is vol of 1 tank
1356.48 times 5=6782.4

answer is 6782.4 ft^2 or D