What is 1+2x3(3+1):::/$/$:7/$.$$,)

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?

What is 1.5% of 120 or what number is 1.5% of 120

Factor the polynomial by its greatest common monomial factor.