Can someone explain how I would solve this step by step

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

Write a linear funtion f with the values f(2)=-1, and f(5)=4

5,678.321 what place value is the 1 in