Answer:
m<3 = 108
Step-by-step explanation:
Since <1 and <2 are supplementary, the equation is:
<1 + <2 = 180
Since <1 and <3 are vertical angles. the equation is:
<1 = <3
To find m<3:
<2 + <3 = 180
72 + <3 = 180
<3 = 180 - 72
<3 = 108
Is the answer because it has no other side like 
Solve this by setting up and solving an equation of ratios:
8 3x
------ = ---------
6+8 2x-2
Cross-multiplying, we get 16x - 16 = 42x
Combining like terms, we get -16 = 26x. Then x = -8/13
