Just simply collect like terms.
3x+4x+5+6
7x+11
        
                    
             
        
        
        
Answer:
504 in3
Step-by-step explanation:
I did the I-Ready too. 
 
        
             
        
        
        
The answer is C), 834, 834.19, 834.2, 834.29
I know this is late, but I hope it was helpful!
 
        
             
        
        
        
Follow the steps
106=x+79+x+45
106=2x+124
-124= -124
-18=2x
( -18)/2=(2x)/2 <----- solving for x
-9=x
then 
angle LMF= -9+79
=70
angle FMN= -9+45
= 36
(when you add 70 and 36 together you get 106 which is the measurement of angle LMN or in other word the whole thing)
In conclusion the answer to the problem is:
Angle LMF is equal to 70.
        
             
        
        
        
The easiest way is to make equations y=2400x+30000 and y=2000+36000
and then put that in the calculator and go to table and the point they intersect at is (15,66000)