The equation of a circle always follows this: 
(x - x1) + (y - y1) = r^2
x1 and y1 represent the coordinates as POSITIVE numbers and the r represent the radius 
Your answer is (x + 1) + (y - 4) = 3
        
                    
             
        
        
        
Answer
given,
on first stop
number of car = 20  and number of trucks = 18 
on second stop
number of car = 18  and number of trucks = 10
we need to calculate which rest stop has higher ratio of car to truck.
Rest Stop 1
 ratio= r₁ =
            r₁ =
            r₁ =
Rest Stop 2
 ratio= r₂ =
            r₂ =
            r₂=
hence, r₂ > r₁
rest stop 2 has more car to truck ratio than rest stop 1
 
        
             
        
        
        
The slope of the first equation has a slope of one and a y intercept of -4. The second equation has a y intercept of -2.3333 as seen when plugging in 0 for x, so the same y-intercept and same line are out of the question. This means either they have the same slope and thus are parallel or intersect at some point. A simple way to find out? Plug in 1 for x on the second. If it isn't -1.33333, which is a slope of positive 1 such as in the first equation, they WILL INTERSECT somewhere. When plugging in 1, we get
 3y - 1 = -7
3y = -6
y = -2
(1, -2) is the next point after (0, -2.3333)
That means it is most certainly not the same slope, and thus they will intersect at some point. The two slopes are 1/1 and 1/3 if you weren't aware.
        
                    
             
        
        
        
B = 26in, c = 40in
a^2 = 26^2 + 40^2
 = 2276 (square root it)
 a = 2root569 // 47.7in
        
             
        
        
        
P(5,2) =  n! /(n-r)!
n = 5, r = 2:
= (5 x 4 x 3 x 2 x 1 ) /  3 x 2 x 1 
Cancel out common factors:
= 5 x 4 = 20
The answer is 20.