−5−4.25⋅−7.4
Writing this to meet 20 character requirement
        
                    
             
        
        
        
Answer: $ 82
Step-by-step explanation:
92 - 10 = 82
 
        
                    
             
        
        
        
The eighth multiple of  8  is  64 .
The fifth multiple of  8  is  40 .
Their difference is  24 .
        
             
        
        
        
The fourth root? There is no simplifying to be done.
The only way to continue work on this is converting to decimal. To four places the answer is 3.3437.
If you meant to ask for the cube root, the answer is 5.