How many times can you find the sequence 123

(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

Which steps could be part of the process in algebraically solving the system of equations, y+5x=x^2+10 and y=4x-10

Solve the triangle. a = 21°, c = 105°, c = 5