Answer:
4200
Step-by-step explanation:
4280=(?)+80
So the answer is 4200
 
        
                    
             
        
        
        
Answer:

Step-by-step explanation:
Using k as the constant of proportionality.
The expression that expresses the relationship : p varies jointly with the square of d and the cube of u.
Varies jointly means that p will change as 'd' and 'u' will change together with respect to their powers. 
We get the expression as:

 
        
             
        
        
        
You can do this just believe in your self
It A
        
             
        
        
        
Answer: C
Step-by-step explanation:
4x + 1 = 9
4x + 1 -1 = 9-1
4x=8
8/4=2