A bag contains 8 black marbles and 20 yellow marbles. you can reach into the bag and pull out a black marble . Then you reach into the bag and pull out another marble. What is the probability that the second marble is yellow?

20/27

Step-by-step explanation:

In the beginning there are 28 different possibilities but since one black marble is eliminated there are 27 possibilities now.

To calculate probability all you have to do is divide the number of desired possibilities (in this case, 20 since there are 20 yellow marbles) by the number of possibilities in total (in this case, 27 since there are 20 yellow marbles + 8-1 black marbles).

This results in the answer becoming 20/27

2x^2+5x+17

your welcome. : )