I need help on this question

Question

The amount of money, in dollars, Sarah has in her savings account is modeled as a function of time in months. This function is represented by the graph below.

What is the average rate of change for the amount of money, in dollars per month, from month 0 to month 12

1. $25 per month
2. $300 per month
3. $500 per month
4. $50 per month

Answer 1

Average rate of change is the slope of the line. This is [$(month 12) - $(month 1)] / 12 (# of months)

I can't see the numbers in your graph, but you should be able to calculate the value from this information.