It's shifted up two units. You can tell this by mapping the point of change as the origin in the original graph and (0,2) in the second graph. 
        
             
        
        
        
The independent variable here is b, the number of mats; the dependent var. is p, the cost of b mats. Thus, p = f(b). 
Here, 245 units^3 = pi*r^2*(5 units), or 
 245 units^3
r^2 = ------------------- = 15.61 units^2. Thus, the radius is sqrt(15.61 units^2), or
 5(3.14) units 3.95 units. The DIAMETER is d = 2*r = 7.90 units.
 
        
                    
             
        
        
        
(8-3)²-(5-2)²
Follow the PEMDAS
P-Parenthesis
E-Exponents
M/D-Multiplication/Division
A/S-Addition/Subtraction
clear the numerals in the parenthesis:
(5)²-(3)²
Now do the exponents:
=25-9
=16
Its just: (5)²-(3)²
        
             
        
        
        
Slope-intercept form is 

, where m is the slope and b is the y-intercept.
Here, we first need to distribute the 1/3.

Next, we add 3 to both sides of the equation.
