Answer:
abd = 30 degrees
Step-by-step explanation:
add angles abd + dbc and set them equal to 85
4x + 2 + 8x - 1 = 85
combine like terms and get:
12x +1 = 85
isolate x by subtracting 1 on both sides:
12x = 84
divide by 12 on both sides to get x:
x=7
now to find the measure of abd, plug in 7 for x:
4(7)+2
28+2
=30
