Answer:
-0.003 %Fahrenheit
Step-by-step explanation:
 
        
             
        
        
        
 They didn’t use a ruler I think they made their own materials from what they had. Also thank you.
 
        
                    
             
        
        
        
First, convert how many yards there were to inches. 3 1/2 yards gets you 126 inches. Next, find out how many inches 2 feet and 10 inches of ribbon is. 34 is your answer. Subtract 34 from 126 to get an answer of 92 inches (7 feet, 6 inches.) 
        
             
        
        
        
Answer: 15%
Step-by-step explanation:
The Percentage decrease will be:
= Decrease in weight / Old weight × 100
= (200 - 170) / 200 × 100
= 30/200 × 100
= 15%
The Percentage decrease is 15%