Which example would be likely to give a valid conclusion? five students are surveyed about their favorite sport. people are asked, "is our great principal doing a good job? " thirty students are randomly sampled about their hair color. four boys are asked about their favorite sport.

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