Answer:
r = 3
Step-by-step explanation:
x^2 + 6x + y^2 - 8y = - 16
Take half the linear term and square it.
x^2 + 6x + (3)^2 + y^2 - 8y + (-4)^2 = - 16 
Add the squared amounts to the right.
x^2 + 6x + 9 + y^2 - 8y + 16 = - 16 + 9 + 16  
Combine on the right. 
x^2 + 6x + 9 + y^2 - 8y + 16 = 9
Represent the 2 quadratics as perfect squares.
(x + 3)^2 + y - 4)^2 = 9
The radius is the square root of 9 which is 3
 
        
                    
             
        
        
        
Answer:
b
Step-by-step explanation:
if you subtract 5x then you will get y=-10-5x
 
        
                    
             
        
        
        
Answer:
Answer is A. 36x-11y
Step-by-step explanation:
34x-12x+14x-18y+7y
=22x+14x-18y+7y
=36x-11y
 
        
             
        
        
        
Answer:
choice 3) acute and equilateral
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
-23
Step-by-step explanation:
you calculate 49-|6-14|x 9
you then calculate the absolute value 
49-|-8|x 9
then multiply the numbers
49-8 x 9
calculate those numbers 
49 - 72 
your solution will be -23