Answer:
<h2>Sam cycled fast, at a rate of 10 miles per hour.</h2>
Step-by-step explanation:
To solve this problem we have to find the slope of each case. The definition of a slope is: 

Where  is the first point, and
 is the first point, and  is the second point.
 is the second point.
Let's find each slope.
<h3>Sam.</h3>
Let's use the points  and
 and 
Applying the definition of the slope, we have:

This relation means that Sam cycled 10 miles per hour.
<h3>Bobby.</h3>
Let's use the points  and
 and 

Bobby cycled 9 miles per hour.
Therefore, according to these ratios, Sam cycled fast, at a rate of 10 miles per hour.
 
        
             
        
        
        
25x^2 - 16 = (5x - 4)(5x + 4)
        
                    
             
        
        
        
Answer:
None of the above 
Step-by-step explanation:
=4+2y+7
x+8=(7x)+
(2y)+(4+8)=7x+2y+12
 
        
                    
             
        
        
        
26. y= -7/3+ 0 or just y= -7/3
27. y= -10