1. If p and q represent two numbers then which of the following expressions always calculates the distance between them when plotted on a number line?
(1) p-q
(3) p+q
(2)|p-q|
(4) \p + q/

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