A cylinder of gasoline can is 18 in across and 20 in tall which expression represents the approximate volume in cubic inches
The volume of a cylinder can be found using the formula V = πr^2h, where r is the radius of the base (half of the diameter) and h is the height of the cylinder.
In this case, the diameter (across) of the cylinder is 18 inches, so the radius is 18/2 = 9 inches. The height of the cylinder is given as 20 inches.
Thus, the expression that represents the approximate volume in cubic inches is:
V ≈ π(9^2)(20) = π(81)(20) = 1620π cubic inches