Final Answer:
The average rate of change in John's savings account balance from week E through week 12 is $XYZ per week.
Step-by-step explanation:
To calculate the average rate of change in John's savings account balance from week E through week 12, you need to find the difference in the account balance at these two points and then divide it by the number of weeks elapsed.
Let's assume John's savings account balance at week E is $A, and at week 12, it's $B.
Average Rate of Change = (Change in balance) / (Number of weeks)
Change in balance = B - A
Given these values, calculate the difference in the balances between week E and week 12. For instance, if the balance at week E is $500 and at week 12 it's $1000, the change in balance would be $1000 - $500 = $500.
Next, ascertain the number of weeks between week E and week 12. If it's, for example, 12 weeks, the formula for the average rate of change would be:
Average Rate of Change = ($1000 - $500) / 12 = $500 / 12 = $XYZ per week.
By performing this calculation with the actual values of John's savings account balances at week E and week 12, and by considering the appropriate number of weeks, you can determine the average rate of change in John's savings account balance over that period.
Ensure to substitute the actual values into the formula to find the accurate average rate of change in John's savings account balance from week E through week 12.