If Keith is represented by x, and Joe is three less than Keith, Troy is represented by x-3. 
Then, we know that Joe exercises for twice the amount of time as Troy, we multiply the expression for Joe by two. 
Keith = x
Troy = x-3
Joe = 2(x-3)
        
             
        
        
        
45.864, because 57.33 divided by 100 is 0.5733 that multiplied by 80 is 45.864
        
             
        
        
        
Answer:
4 11/12
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
I think is 18
Step-by-step explanation:
because is the same of the L
 
        
             
        
        
        
Answer:
19
Step-by-step explanation:
Given 2 sides of a triangle then the third side x is
difference of 2 sides < x < sum of 2 sides , that is
18 - 2 < x < 18 + 2
16 < x < 20
Then the largest possible length of the third side is 19