Halfway between 21,000 and 22,000 is?

What properties allow transformation to be used as a problem solving tool

If t8 = 4 and t12 = −2, find the first three terms of the arithmetic sequence.

Examine this system of equations. what integer should the second equation be multiplied by so that when the two equations are added together, the x term is eliminated? 3/4x+1/7y=6 1/8x-3/5y=16