Help!! Find the volume of the Cylinder.

Which of the following expressions is equal to 2x^2+8

The border line of the linear inequality 4x + 7y < 5 is dotted true or false?

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?