Answer: 2
Step-by-step explanation: 60 divided by five is 12. you divide that by your answer from 12 by 2, which is 6. 12 divided by 6 is two.
I disagree with the student because the slope is the rate of change. The slope would be 10 because the rocks are increasing by 10 every month.
Can you send us a picture of the question please
