Answer:
negative 8
Step-by-step explanation:
 
        
                    
             
        
        
        
There is no common factor between 15, 17 and 18 because 17 is prime.  
15z² +17z - 18 =  
d = 17² - 4.15.-18  
d = 289 + 1080  
d = 1369  
z = (-17 +/- \/1369) : 2 * 15  
z = (-17 + 37) : 30  
z' = 20 : 30 = 2/3  
z" = (-17 - 37) : 30  
z" = -54 : 30 = -1.8  
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Answer:
Step-by-step explanation:
<u>Given points:</u>
- A(-1, -9) and M(0.5, -2.5)
Let the coordinates of B are (x, y)
<u>Use midpoint formula to determine the point B:</u>
- 0.5 = (- 1 + x)/2 ⇒ 1 = -1 + x ⇒ x = 1 + 1 = 2
- -2.5 = (-9 + y)/2 ⇒ -5 = -9 + y ⇒ y = -5 + 9 = 4
 
        
             
        
        
        
The answer should be 101.
        
                    
             
        
        
        
Answer :
m = 3
Point = (4,-1)
x1 = 4
y1 = -1
Formula =
y - y1 = m (x-x1) 
y - (-1) = 3 (x -4)
y + 1 = 3x -12
y - 3x + 1 + 12 = 0
y - 3x + 13 = 0
The line = y - 3x + 13 = 0 or -3x + y + 13 = 0
I'm sorry if I'm wrong. 
Cmiiw
Good luck
Love from Indonesia