The volume vr (in cubic meters) of a spherical balloon with radius r meters is given by =vr43πr3. the radius wt (in meters) after t seconds is given by =wt+8t3. write a formula for the volume mt (in cubic meters) of the balloon after t seconds. it is not necessary to simplify.

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.