The answer would be a=c/d • b.
To get a by itself, you multiply both sides by b so there will no longer be any other variables with the a.
the answer is the 3rd opiton
4x -(9-3x) = 8x-1
4x -9 + 3x = 8x-1
7x-9 = 8x-1
-9 + 1 = 8x-7x
-8 = x
x = -8
Let 
be the area of the sector in the larger circle (radius 12 cm) whose central angle is subtended by the labeled arc with measure 45 deg, and let 
be the area of the sector in the smaller circle (radius 8 cm) with the same central angle. The area you want is 
.
We have
So the area of the shaded region is 
.
Answer:
12.5%
Step-by-step explanation:
