Ok, so we know that RST is equal to 6x+12
And RST is also equal to 78 + 3x-12
so we set them equal to each other
6x + 12 = 3x - 12 + 78
And simplify
3x = 54
x = 18
Finally, we solve for the angle with 18 for x
6(18) + 12
108 + 12
120
Hope this helps
        
             
        
        
        
Answer:
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Step-by-step explanation:
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The quotient of 78,600 and 12 is 6,550
 
        
             
        
        
        
The 8 is in the hundreds 
The  1  is in the tenths
The  8  is in the hundredths
The  5  is in the thousandths
 
        
             
        
        
        
Ever year she gets 15 silver dollars, so she will have 64 silver dollars