You go out to dinner and are charged $90 for your meal. The service was wonderful, so you tip 20%
on top of the $90. What is the total you paid after tip?

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