By the external angle theorem 
5x = (5x - 30) +  m < RST
m < RST  = 5x - 5x + 30  = 30
 also m < STR = m < SRT = 5x - 30
So as there are 180 degrees in a triangle:-
5x - 30 + 5x - 30 + 30 = 180
10x = 180 +30+30-30 = 210
x = 21 answer
        
                    
             
        
        
        
Answer:
0.6b - 3c
Step-by-step explanation:
Multiply 0.2 and 3b
0.2 x 3b = 0.6b
Then multiply 0.2 and 15c
0.2 x 15c = 3c
We can't add these, 3c and 6b because they have different letters.
different letter vs. different letter = 
don't add
different letter vs. normal number like 5 =
dont add
same letter vs. same letter =
add
normal number vs. normal number =
add
This all goes the same for dividing, subtracting, and multiplying
I hope this helped! :)
 
        
                    
             
        
        
        
Answer:
iohji
Step-by-step explanation:
 
        
             
        
        
        
The answer is C hope this helps
        
                    
             
        
        
        
Answer: the answer is letter A
Step-by-step explanation: