f(b) = -1/6b + 8. Is the function rule if you want. further explanation just ask. 
 
        
             
        
        
        
The picture is off point so I can’t read the entire paper!! Sorry and GOOD LUCK
        
             
        
        
        
Step-by-step explanation:
1. yes 4+16 = 20
2. yes 32 - 4 = 28
3. yes 4(10) = 40
4. no 24/6 = 4
 
        
                    
             
        
        
        
A = cross sectional area of the pipe. When the pressure is expressed in terms of the equivalent height of a column of that fluid, as is common with water, the friction loss is expressed as S, the "head loss" per length of pipe, a dimensionless quantity also known as the hydraulic slope.