Too hard for me. I'm only in 5th grade
        
             
        
        
        
The question is kind of vague in my opinion.
the best measurement to report with the scale in my opinion would be tens of pounds. my reasoning is because the decimal place would still prove importance with numbers under one hundred. above one hundred pounds and the decimal place becomes kind of pointless. 
I hope I answered your question. though i'm sorry if i didn't 
        
             
        
        
        
I'm not totally sure, but it might be y= x/7.
        
             
        
        
        
Answer:
x=90-22
x=68
as the ray divide the right angle into 2