Stacy decided that she would start doing sit ups every day. Her plan each day was to do twice as many sit ups as she had done the day devote. If Stacy did two sit up one day, how many total sit ups would she have done after five days?

David and alton are training for a race. they spend 35 minutes stretching and then go on a 5 mile practice run. david runs at a pace of 7 min/mile. alton runs at a pace of 8 min/mile. write an equation for each runner that shows the total length of their workout. then solve each equation showing your work