I'll put my answer is the comments when I know what I'm looking for. I just need the power.
Answer:
C. 
Step-by-step explanation:
The radius of the circle is 24 units, then the area of the whole circle is

The shaded circle is limited by 45° angle, so its area is
of the area of the whole circle.
The area of the shaded circle is
There are 3 terms : 7x , 4y, and 1.
a term is separated by any math symbol
examples are =, +, *