For lesson 4 10^15/10^4= 10^11 because when you are dividing with exponents you have to subtract the bottom exponent with the top one so 15-4=11; 10^15/10^4=10^11
        
                    
             
        
        
        
D.15 because 15 divided by 5 is 3 and 3+7 is equal to 10. Hope that helped
        
             
        
        
        
Answer: 20
Step-by-step explanation: