I need help this is very hard:

8 1/3xy+4/5=9/10

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.

Which coefficient matrix represents a system of linear equations that has a unique solution ? options in photo*

For a function f(x), a) if f(7) = 22 then f^-1(22) = b) f^-1(f(c)) =