Which property can be used t show that 4r+3s+2r=6r+3s?

Quick translate "x is 12 units from 20" into an equation. what are the values of x being described? if you can answer any of my other questions that'd be great too

Simplify (1/2)4th power a. (1/16) b.(1/8) c.(1/4)

If you prove that ∆wxz is congruent to ∆yzx, which general statement best describes what you have proved?