Cis the circumcenter of triangle pqr. pc=3x-7 rc=5x-15 & qc= 51-x what does pc equal?

"how does lena finally defeat the robots? ” this question will best be used to describe the story’s exposition. rising action. climax. falling action.

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?

Two numbers have a sum of -19. one number is x. what expression represents the other number?