The function f(x) is the number of feet below the surface of the water a diver is at x seconds. It took the diver 20 seconds to swim a depth of 15 feet and return to the surface.
What is the practical domain for the function f(x)?

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.