A bag contains 4 green marbles, 6 red marbles, 14 orange marbles, 5 brown marbles, and 8 blue marbles. you choose a marble, replace it, and choose gain, what is P (red, then blue) ?

By what is P i assume you mean what is the probability.

Well probability is always the specific group divided by the total

To find the total add all the marbles together

4 + 6 + 14 + 5 + 8 = 37

Before we move on notice the question says that the marble is replaced after being chosen meaning the total stays the same for every pick

Red Marbles Probability:

red marbles / total

6/37 or if you divide it out 0.162

Blue Marbles Probability:

blue marbles/total

8/37 or 0.216