Draw a line from the orgin, o, to point D and from o to D measure the angle formed by OD and OD how many degrees was figure?

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?

An investment decreases in value by 30% in the first year and decreases by 40% in the second year. what is the percent decrease in percentage in the investment after two years

Use the elimination method to solve the systems of equations.choose the correct ordered pair. 7x+4y=39