Answer 

step by step Explanation 
The functions given are


We want to find:

This implies that 

Let us now simplify 

This implies that

Combine the terms to get,

 
 
        
        
        
Answer:
42 - 6 - 6 - 6 - 6 - 6 - 6 - 6 = 0
or
42 - 7 - 7 - 7 - 7 - 7 - 7 = 0
 
        
             
        
        
        
100 is the y intercept so its graohed at (0,100)(y-axis) and it goes up every 1/55
        
             
        
        
        
356/8 = 44.5
44.5 miles per hour, miles/hour