Which property justifies his step in simplifying an expression?
5x2+x2+4=(5x2+x2)+2x+4
-the associative property
-the inverse property
-the commutative property
-the distributive property

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?

Factor and solve to find roots x squared -x - 90 =0

Which point-slope form equation represents a line that passes through (3,-2) with a slope of -4/5