Can someone please please help me I don’t understand

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

What set does not contain -3 the set of all real numbers the set of all integers the set of all whole numbers the set of all rational numbers

(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