Number 1 is A.Q and S because if you flip the shape around the degrees will be the same
Number is 42 degrees if you multiple 42•2 is 84-26 is 58 and 42 plus 16 is 58 which are equal if you substitute any of the other choices it will not be equal
The theorem is that for a line bisecting two parallel lines, the oposite angles are equal. Hence, you can formulate the equation 4x+18 = 7x-21, which solves to 13.
