6+ x is an example of a. a variable b. an expression c. a constant d. a formula exsplain how you got the answer and ill give you !

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

Which expression is equivalent to 4 square root 6 divided by 3 root 2

Need on this one asap im almost done with this subject