I would say complementary because the angle degrees are the same
        
             
        
        
        
Answer:
The rate of change is 0.75 gallons per minute
Step-by-step explanation:
The rate of change of the linear relation is represented by the slope of the line which represents this relation
The rule of the slope of a line is 
m = Δy/Δx, where 
- Δy is the vertical change
- Δx is the horizontal change
From the given graph
∵ The line passes through points (0, 0) and (4, 3)
∴ Δx = 4 - 0 = 4
∴ Δy = 3 - 0 = 3
→ Use the rule of the slope above to find the slope of the line
∴ m =  = 0.75
 = 0.75
∵ The x-axis represents the time in minutes
∵ The y-axis represents the amount in gallons
∵ m represents the rate of change
∴ The rate of change = 0.75 gallons per minute
 
        
             
        
        
        
The equation of a circle with center  and radius
 and radius  is
 is

In your case,

Plug these values into the generic formula and you'll get your equation.
 
        
             
        
        
        
25----------5 and 5--------------5 and 1 ------------5 and 1