How do you find the area of a rectangle

Describe the possible echelon forms of the standard matrix for a linear transformation t where t: set of real numbers is onto.

(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

The answer is 7.2 how would you put this as money