The intersection point of the graphs of the following system of
equations has an x-coordinate of 5 and a y-coordinate of 2.
What information does this intersection point provide

Ametalworker has a metal alloy that is 30? % copper and another alloy that is 55? % copper. how many kilograms of each alloy should the metalworker combine to create 90 kg of a 50? % copper? alloy?

This is so harddd! solve. 1 + 1 = solve 4 + 4 = solve 3 x 3

Use the inverse of the function y=x^2-18x to find the unknown value [tex]y = \sqrt{bx + c \: + d} [/tex]