John starts climbing a very steep hill.  He travels 1 foot vertically for every two feet horizontally.  His elevation increases from 100 feet to 1450 feet.  How far does he move horizontally, in feet?
He travels 1450-100=<T>subtract(1450, 100)=1350 feet vertically
So he travels 1350*2=<T>multiply(1350, 2)=2700 feet horizontally
