mike charges 100 dollars service charge plus 65 dollars per hour.  
amy charges 40 dollars service charge plus 80 dollars per hour.  
the cost to repair from mike is 100 + 65 * x.  
the cost to repair from amy is 40 + 80 * x.  
let x = 3 and you get:  
the cost to repair from mike is 100 + 65 * 3 = 295 dollars.  
the cost to repaid from amy is 40 + 80 * 3 = 280 dollars.  
as long as the time to repair is 3 hours or less, the cost to repair will be cheaper from amy. 
 
        
             
        
        
        
Answer:
D, The last one
Step-by-step explanation:
Hope this Helps!
 
        
             
        
        
        
Answer:
(3/2, 6) 
Step-by-step explanation:
y = 4x 
8x + y = 18
this says y is 4x so you can replace y with 4x
8x + 4x = 18
12x = 18
/12      /12
   x  = 3/2
now sub x into y = 4(3/2)
y = 12/2 
y = 6
 
 
        
                    
             
        
        
        
Answer:
x = 15
Step-by-step explanation:
This involves the Secant and Segments Theorem.
8(19 + 8) = 9(9 + x)
216 = 81 + 9x
9x = 135
x = 15