Evan withdrew a total of $160 from the atm machine over a 4-day period. if he withdrew the same amount of money each day, what integer repersents the total amount his account changed each day

Divide 160 by 4 to find how much money he withdrew every day. That gives you $40, which means that Evan withdrew $40 from his account every day. Now that you know this, you know that the total amount in his account decreased by $40 each day.