Simplify be combining like terms: -3+6x-18-22x

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?

A50% increase followed by 33 1/2% decrease

What is the missing reason in the proof? segment addition congruent segments theorem transitive property of equality subtraction property of equality?