Help ASAP please! ill mark brainliest!

£100.80 divided by 14 equals 7.2 how would we put this as money

Lines a and b are perpendicular. if the slope of line a is 3, what is the slope of line b?

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