Suppose that the amount of algae in a pond doubles every 5 hours. if the pond initially contains 10 pounds of algae, how much algae will be in the pond after 20 hours?

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