Answer:
24F is a increase I belive and 39F is a decrease
Answer:

Step-by-step explanation:

Answer:
30
Step-by-step explanation:
boys: girls : total
3 7 3+7 =10
The total number of students must be a multiple of 10
The class size is between 22 and 34
The only multiple of 10 between those numbers is 30
10,20,<u>30</u>,40
Therefor the class size must be 30
Answer:
1
2
3
may be I'm ryt confirm wih some others