To the math with the denominator and use the same number with the numerator
        
             
        
        
        
<h2>
Answer:</h2>
The error interval for x is:
                   [3.65,3.74]
<h2>
Step-by-step explanation:</h2>
The number after rounding off is obtained as:
                           3.7
We know that any of the number below on rounding off the number to the first decimal place will result in 3.7:
    3.65     3.66    3.67    3.68    3.69    3.70    3.71   3.72    3.73    3.74
( Because if we have to round off a number present in decimals to n place then if  there is a  number greater than or equal to 5 at n+1 place then it will result to the one higher digit  at nth place on rounding off and won't change the digit if it less than 5 )
           Hence, the error interval is:
              [3.65,3.74]
      
 
        
        
        
I think the answer would be 81.60