Answer:
x = 5
Step-by-step explanation:
11. <C=46 degrees
<D = - 1+8x
<B = 180 - (18x+5)
<C + <D + <B = 180 degrees
46 - 1 + 8x + 180 - 18x - 5 = 180
-8x = 180 - 180 -46 +1 +5
-8x = -40
x = -49/-8
