A bedroom door has an area of 21 square feet. Its perimeter is 20 feet. What are the dimensions of the door?

What is the simplified expression for 6(2(y+x))

Of four points are collinear, they are also coplanar

(mc 02.03) what set of reflections and rotations would carry rectangle abcd onto itself? reflect over the y-axis, reflect over the x-axis, rotate 180° rotate 180°, reflect over the x-axis, reflect over the line y=x reflect over the x-axis, rotate 180°, reflect over the x-axis rotate 180, reflect over the y-axis, reflect over the line y=x