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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?

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15

What is the similarity ratio of a cube with volume 729m^3 to a cube with volume 3375 m^3