Why is it often necessary to add air to your car tires during the winter?

Because the colder it is, the lower the pressure in the tire is. The cold temperature will bring down the tire pressure and cause it to deflate.

the rebels’ chances of victory at lexington & concord were fairly slim, given the fact that most of them very untrained and they were up against the world's greatest military force.  

the atm that sounds like it should be the answer