The rate of change is -$12.50 per week.
How the rate of change is computed:
The initial amount Michael started the savings account with = $800
The amount in the savings account after 4 weeks = $750
The amount in the savings account after 10 weeks = $675
The rate of change per week:
Difference between the initial amount and the amount after 4 weeks = $50 ($800 - $750)
The number of weeks between the first and 4th week = 4
Rate of change in the savings account after 4 weeks = 12.5 ($50/4)
Difference between the amount after 4 weeks and after 10 weeks = $75 ($750 - $675)
The number of weeks between the 4th week and the 10th week = 6.
Rate of change in the savings account after 4 weeks = 12.5 ($75/6)
Thus, the rate of change in Michael's saving account is constantly -12.50 per week.
Complete Question:
Michael started a savings account with $800. After 4 weeks, he had $750 dollars, and after 10 weeks, he had $675. What is the rate of change of money in his savings account per week?