Answer:
1/3
Explanation:
Total number of people who play sports in the Algebra 2 class:

If there are 10 students who play Basketball, there are 2 students who ONLY play Baseball. If there are 9 students who play Baseball, there are 3 students who ONLY play Basketball.
So the number of students who play BOTH sports is:

If 7 from the 21 Algebra 2 class students play BOTH sports, the probability is:
