Please help?

Simplify: (4a−2b)(a+b) 4a2−8ab−2b2 4a2−6ab−2b2 4a2+2ab−2b2 4a2−2ab−2b2

The table respent two linear functions the equation respented by the first tables is given

Consider the following estimates from the early 2010s of shares of income to each group. country poorest 40% next 30% richest 30% bolivia 10 25 65 chile 10 20 70 uruguay 20 30 50 1.) using the 4-point curved line drawing tool, plot the lorenz curve for bolivia. properly label your curve. 2.) using the 4-point curved line drawing tool, plot the lorenz curve for uruguay. properly label your curve.

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.