X = first place....and each place after that is 50 less
so 2nd place would be x - 50 and third place would be x - 100
so ur answers are : 
b. x + (x - 50) + (x - 100)
f. 3x - 150 ...u get this when u combine like terms
        
                    
             
        
        
        
Answer:
1/2
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
10 inches.
Step-by-step explanation:
Because an isosceles has two equal sides and on different one 
 
        
             
        
        
        
Answer:
   2444
Step-by-step explanation:
The total cost is the integral of the marginal cost.
   
The total cost of producing units 144 through 625 is 2444.
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If all you need is a number, a graphing calculator can give you that.