Find two numbers if there sum is 7.2 and their difference is 2.7

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

Can someone me with this problem . show your work .

Which type of graph would allow us to quickly see how many students between 100 and 200 students were treated?