3x-12 and x-4 Identify weather the expression is equivalent. Writhe YES or NO and JUSTIFY your answer with math or words

Find the value of a. the diagram is not to scale. a quadrilateral is drawn. the upper and lower sides are parallel. the interior angle in the upper left corner is labeled a degrees. the angle in the upper right corner is labeled 113 degrees. the angle in the lower right corner is labeled b degrees. the angle in the lower left corner is labeled 36 degrees. a. 36 b. 144 c. 54 d. 126

Ineed i been stuck on this question since yesterday

If g^-1(x) is the inverse of g (x) which statement must be true