Answer:
The third one
Step-by-step explanation:
Answer:

Step-by-step explanation:
Subtract 7 From both sides

7-7 = 0, 16 - 7=9
That leaves 
Hope this helps
~R3V0
Answer: C, you are correct
Step-by-step explanation:
Answer:
500 times
Step-by-step explanation:
They breathe 20 times per minute for 25 minutes
20(times per minute) x 25(minutes) = 500