Need all the help I can get please help me I need the pints or I don’t pass math!

If the sales price of a dvd is $20 and the markup is 34%, what is the cost of the dvd?

Abag contains 3 red marbles, 2 blue marbles, and 2 green marbles. one marble is picked, then another marble. assume that the selections are made with replacement. a) find the probability of picking two red marbles with replacement. b) find the probability of picking a red marble and a blue marble. assume the selections are made without replacement. c) find the probability of picking two red marbles without replacement. d) find the probability of picking a red marble and a blue marble without replacement.

The radius of a sphere is 3 inches. which represents the volume of the sphere?