Still do not understand how its work

Which diagram best shows how fraction bars can be used to evaluate 1/2 divided by 1/4?

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

Which function has the vertex at (2,6)