Question

I will give you brainliest and points like 100.

Answer 1

Answer:

3 have only been in ballet

Step-by-step explanation:

If

5 have been in ballet

9 have been in play

2 have been in both ballet and a play

Then

3 have only been in ballet

7 have only been in a play

Answer 2

Answer:

4 students

Step-by-step explanation:

add 2 + 5 = 7

add 9 + 2 = 11

subtract 11 - 7 = 4

there was 2 students added to the 5 students, there was 2 students added to the 9 students/ Sorry if incorrect, i worked it out 4 times.