Volume of a cylinder = the area of the base x height of the cylinder
Area of base = \(\pi\)r^2
A = 6^2(\(\pi\))
A = 36\(\pi\)
V = 36\(\pi\) x 12
V = 432\(\pi\)
5 cylinders = 5V
5V = 5 x (432\(\pi\))
5V = 2160\(\pi\)
Final answer: Alex needs to buy 2160\(\pi\) or 6785.84 cubic feet worth of compressed air to fill all of the cylindrical tanks.
