75 US gallons = 17,325 cubic inches.
There are 1000 milliliters in a liter. A milliliter and a cubic centimeter are equivalent, so there are 1000 cubic centimeters in a liter. .75 liters would have 750 cc's. If you multiply 1000 by .75, the answer is 750.
7.34 cu yds.
12.04 cubic yards.
112500 cubic inches
A US liquid gallon occupies 231 cubic inches. A cubic foot occupies 12" * 12" * 12" = 1728 cubic inches, so there are 1728/231 = 7.48 gallons in a cubic foot. The hot tub has a volume of 5 * 5 * 3 = 75 cubic feet. So it contains 75 * 7.48 = 561 gallons.
75 millimeters = 2.95275591 inches
75 cubic feet
Assuming a thickness of four inches, there would be a total of 139 (138.89) cubic yards of concrete.
75 feet is equal to 900 inches. 12 inches multiplied by 75 equals 900 inches
75 inches = 6.25 feet
75 cubic feet