We will do this step by step
First the rectangle on the left
The dimensions are 9 and 16
Do you know how to find the area of a rectangle
Multiply $20 by 20% good luck
The answer is A.
D= 6<=x<=11
The Law of Sines says



We don't have to worry about the obtuse supplement because a triangle can only have one obtuse angle, and that's B.

Answer: A=29.44°, C=34.96°