The volume of a cylinder is 45x² cubic units and its height is x units,
which expression represents the radius of the cylinder, in units?
2x
4x
20x?
40x2

Afitness center has 2 membership plans one has a low dollar sign up fee of 15 dollars and costs 38 dollars per month to join. a second plan has a higher sign up fee of 78 dollars but a lower monthly fee of 31 dollars for what number of days of the month is the coat the same