Answer:
40
Step-by-step explanation:
Calculator.
 
        
                    
             
        
        
        
The answer would be <span><span>f<span>−1</span></span><span>(x)</span></span>=<span>√<span>36+x</span></span>,<span>−<span>√<span>36+<span>x. I didn't know it in word form :(</span></span></span></span>
        
             
        
        
        
Its 81 centimeters because you round 5 and over. So nearest centimeter means 2 whole numbers which is 81