Find the perimeter of a rectangle measuring 513 mm by 712mm

I think you have to add 513mm and 712mm to get the perimeter of your rectangle hope this helped

h x w = perimeter
h=513mm  w=712mm

513mm x 712mm = 365,256mm

The density of the cube is 40

It's like discovering the answer to a puzzle. the purpose in solving an equation is to find the value or values of the variable that makes it a true statement. any value of the variable that makes the equation true is called a solution to the equation.