Need this due by 12 so 6 hours help :)

Me, prove a quadrilateral with vertices g(1,-1), h(5,1), i(4,3) and j(0,1) is a rectangle using the parallelogram method and a rectangle method.

What is the value of the discriminant of the quadratic equation -2x = -8x + 8 and what does its value mean about thenumber of real number solutions the equation has?

How many solutions does the nonlinear system of equations graphed below have? a. one b. zero c. four d. two