Answer:
d^-1(t)=t/70
Step-by-step explanation:
 
        
             
        
        
        
Answer:
1x1
Step-by-step explanation:
 
        
             
        
        
        
Answer:
3 and 5, 15; 4 and 10, 20
Step-by-step explanation:
The lowest number divided by 3 and 5 is 15. Same for 4 and 10. The lowest number they can both be divided by is 20.