What is the measure of ∠ACV shown in purple? Math item stem image

Which of the following system of equation is not equal to the system of equations is not equal to the system of equations shown below

What is a possible solutions of the x> 3?

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