17 pts identify the property: -6.5 + (-7.4) + (-8.3)= -(6.5 + 7.4) + (-8.3)

Multiplying an even number of negative numbers gives an answer that is choose from:

Solve: 3x+y=6 4x-2y=18 show all work !

The area of a rectangle is 10 cm^2. one side of the rectangle is x cm. express the perimeter of the rectangle in terms of x and show that this rectangle cannot have a perimeter of 12 cm. the perimeter of the rectangle in terms of x is __ cm