Answer: 18 degrees
Explanation:
d = 117
c = 9x + 18
A = 18
b = ?
you gotta minus 117 degrees by 180 degrees because its a vertical line and a strait line equals 180 degrees and the answer for D equals to 63.
to find out A to find put B you gotta do some algebra so 18x = 9x +18 + 63,
first you gotta get rid of 9x so u subtract 9x from 18x so now you got 9x = 18 + 63 now simplify this so 9x = 81 and now divide 9x by it self that leaves to 9 now divide 9 by 81 because when you do algebra you gotta do the same to the other side too, and that equals to 9 so now 18 x 9 = 162 degrees now minus it because its a vertical line and a strait line equals 180 degrees and the answer for B = 18 degrees
hopefuly it's correct good luck