Answer:
36
Step-by-step explanation:
AOB + BOC = AOC
AOC = 90 since the lines are perpendicular
6x-12 + 3x+30 = 90
Combine like terms
9x + 18 = 90
Subtract 18 from each side
9x+18-18 = 90-18
9x = 72
divide by 9
9x/9 = 72/9
x = 8
AOB = 6x - 12
= 6*8 - 12
= 48 -12
= 36
Answer:
<h2>18a - 24</h2>
Step-by-step explanation:
Use distributive property: a(b + c) = ab + ac

The answer is 4188.79 inches
For direct variation:
y = kx
9 = 12k
k = 9/12 = 3/4