How do you do this? I dont know how please help ASAP

Which undefined geometric term is described as a location on a coordinate plane that is designed by an ordered pair (x,y) ?

How many kilometers are equal to 5 miles? use 1 mile ≈ 1.61 kilometers. !

Two cyclists 84 miles apart start riding toward each other at the same. one cycles 2 times as fast as the other. if they meet 4 hours later, what is the speed (in mi/h) of the faster cyclist?