A line adds up to equal 180 degrees. And adjacent angles also add to equal 180 since they share a side on a line. So add them together and make them equal 180
9x - 7 + 8.5x + 4 = 180
17.5x - 3 = 180
17.5x = 183
x = 10.5
        
             
        
        
        
Answer:
2
Step-by-step explanation:
 
        
             
        
        
        
Answer:
x= 11
A=59
B= 37
C = 84
Step-by-step explanation:
A triangle adds up to 180 °.
So the equation will be a °+ b° + c° = 180°
Next, you combine like terms.

Then inverse operation, 

After to get a, b, and c you just need to plug in x.

 
        
             
        
        
        
Answer:
Hi! The answer to your question is 0.375
Step-by-step explanation:
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Number 3 it is a factor because if u expand you will see that x+6 will be the answer