Each year, Paul's aunt gives him a birthday gift of $100 in cash. Paul deposits the money into an account that earns simple interest at a rate of 4%. Paul makes no withdrawals. How much interest has his account earned after 7 years?​

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