21.07 beacuse when you add them all up you get that..
 
        
                    
             
        
        
        
Answer:
x = 4 ± 
Step-by-step explanation:
Given
(x - 12)(x + 4) = 9 ← expand the left side using FOIL
x² - 8x - 48 = 9 ( ad 48 to both sides )
x² - 8x = 57
To complete the square
add ( half the coefficient of the x- term )² to both sides
x² + 2(- 4)x + 16 = 57 + 16
(x - 4)² = 73 ( take the square root of both sides )
x - 4 = ±  ( add 4 to both sides )
 ( add 4 to both sides )
x = 4 ± 
 
        
                    
             
        
        
        
For example, the probability of an outcome of heads on the toss of a fair coin is ½ or 0.5. The probability of an event can also be expressed as a percentage (e.g., an outcome of heads on the toss of a fair coin is 50% likely) or as odds (e.g., the odds of heads on the toss of a fair coin is 1:1).
        
             
        
        
        
Answer: -24 divided by -6p
how many times does 6 fit into 24? 4 times.
since 6 is already negative, 4 is positive. if 4 was negative, 24 would be positive. 
-24=-6×4 
your number line would consist of 4 in the middle of your line, with numbers 1-10 plotted around to show that 4 is positive. 
 
        
             
        
        
        
First find the slope between any two points:

Where 

 are the two points
So calculating the slope:

So the slope is 

And our equation will be in the format of 

where 

 and 

So, now we have half of the equation:

Now to calculate b, we can plug in a point 

 and solve for b.
So

Lets use the point

So:

And then:

So our final equation is 
