Round 5.1234 to the nearest thousandths

Module 10 coordinate proof using slope and distance answers is quadrilateral abcd a parallelogram? explain how you know.

How do you use the elimination method for this question? explain, because i really want to understand!

During a bike challenge riders have to collect various colored ribbons each 1/2 mile they collect a red ribbon each eighth mile they collect a green ribbon and each quarter mile they collect a blue ribbion wich colors of ribion will be collected at the 3/4 markrer