To make concrete, you need 3 times as much sand as cement. When Aaron was asked to formulate an equation about the relationship between sand and cement in concrete, here’s what he wrote:

What is 32+4 x (16 x 1/2) -2 show your work}

Which of the following circles have their centers on the x-axis? check all that apply.

Aclassmate thinks that solving a system by graphing gives an exact answer when the lines appear to cross at a grid point, but only an approximate answer when they don't. explain why this isn't true.