Please help I don't know the answer to this question.

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

Solve the system of equations. x=-2y+1 and x+2y=9. show work

Asugar cube is inch on each edge. how much volume does it occupy?