7/12-(1/4). first you need a common denominator which is 12. in the first fraction we already have a 12, so we don't need to multiply times anything, but the second fraction already has a 4, so what times 4 is 12, 3.
a place along a road, border, etc., where travelers are stopped for inspection. 2. a point or item, especially in a procedure, for notation, inspection, or confirmation. Origin of checkpoint. 1935-1940.
A: A sobriety checkpoint, also called a D.U.I. roadblock, is a roadblock set up by law enforcement officers in order to stop every vehicle or a subset of vehicles (every third, every tenth, etc.) passing through the checkpoint for the purpose of questioning drivers about driving under the influence of alcohol or drugs.