Answer:
Ryan's bank account decreases by $12 every week.
Explanation:
To find the weekly change in Ryan's bank account, we need to divide the total amount withdrawn over the last 6 weeks by the number of weeks. If Ryan withdrew $72 over the last 6 weeks, and we divide that amount by 6, we get $72/6 = $<<72/6=12>>12 per week.
Therefore, the integer representing the weekly change in Ryan's bank account is 12. This means that Ryan's bank account decreases by $12 every week.