The volume of a cylinder is 4pix^3 cubic units and its height is x units.
Which expression represents the radius of the cylinder, in units?
2x
4x
2pix^2
4pix^2

The average human heart beats 72 beats per minute. how many times does it beat in 15 seconds?

Matt and brian were solving a system of equations. they both noticed that the two lines had the same slope. brian said that because each line in the system had the same slope, the two lines had to be parallel, which meant the solution to the system was "no solution" matt disagreed, and said they should also look at the y-intercepts before determining how many solutions there were. who is correct?

Ateacher noticed 5/8 of the students were wearing either blue shorts or white shorts. write two different ways this could be done.