If we change one side of a square by factor of 5, of 0.5, of 12 and of 1/12 , by what factor will the perimeter change?

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?

If the graphs of the linear equations in a system are parallel, what does that mean about the possible solution(s) of the system? a. there are infinitely many solutions. b. there is no solution. c. there is exactly one solution. d. the lines in a system cannot be parallel.

Before simplifying, how many terms are there in the expression 2x - 5y + 3 + x?