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.
Checkpoint Charlie (or Checkpoint C) was the name given by the Western Allies to the best-known Berlin Wall crossing point between East Berlin and West Berlin during the Cold War. The Soviet Union prompted the construction of the Berlin Wall in 1961 to stop Eastern Bloc emigration westward through the Soviet border system, preventing escape across the city sector border from East Berlin to West Berlin.