The perimeter of the trapezoid be is 12a^2-2ab+9b^ (the ^ are exponents). What is the length of the missing side?

What is the measure of x, in degrees

How is working backward similar to solving an equation?

Angle xyz is formed by segments xy and yz on the coordinate grid below: a coordinate plane is shown. angle xyz has endpoints at 3 comma negative 1 and 6 negative 2 and 3 comma negative 3 and measures 36.87 degrees. angle xyz is rotated 270 degrees counterclockwise about the origin to form angle x′y′z′. which statement shows the measure of angle x′y′z′?