Lauren bought two items to make dinner. She says the difference in mass between the items she bought is 4,000 grams. Which two items did Lauren buy?

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