Perry has 81 red balls, which she wants to arrange in rows. if the number of balls in each row must be equal to the number of rows, how many balls must there be in a row?

He mass of a single atom of carbon can be found by dividing the atomic mass (12.01 g) by 6.022 x 10^23. which is the mass of a single carbon atom, correctly written in scientific notation with the correct number of significant figures?

The plant were you work has a cylindrical oil tank that is 2.5 feet across on the inside and 10 feet high. the depth of the oil in the tank is 2 feet. about how many gallons of oil are in the tank?

Through which points should a line of rotation be placed to create a cylinder with a radius of 3 units