Answer:
r = 8,9,10
Step-by-step explanation:
The given inequality is :
5r≤6r−8  ...(1)
We need to find the value of r.
Subtracting 5r to both sides of the inequality .
5r-5r≤6r-5r−8
0≤r−8
r ≥ 8 
Hence, the values of r are 8,9,10.
 
        
                    
             
        
        
        
Answer:
4) add 5x and 9x 
  answer:   14x - 30
7) subtract 28 from 15 
answer: x - 13
Step-by-step explanation:  sorry if it is wrong I try my best
 
        
             
        
        
        
Answer:
   24 in³
Step-by-step explanation:
The volume of a prism is given by the formula ...
   V = Bh
where B is the area of the base, and h is the height.
The volume of a pyramid is given by the formula ...
   V = (1/3)Bh
where B and h have the same definitions.
For a pyramid with the same B and h as a prism, the volume is 1/3 that of the prism:
   (1/3) × (72 in³) = 24 in³ . . . . volume of the pyramid
 
        
             
        
        
        
Answer:
5
Step-by-step explanation:
take your price and subtract the monthly price 
115-40=75 
now you have the price of all your extra devices summed up
75÷15=5 extra devices