Step-by-step explanation:
everything can be found in the picture 
 
        
             
        
        
        
Answer:
option C

Step-by-step explanation:
we have

using a graphing tool 
see the attached figure N
The range is the interval--------> (-∞,8]

case A) 
using a graphing tool
The range is the interval--------> [-8,∞)

case B) 
using a graphing tool
The range is the interval--------> [8,∞)

case C) 
using a graphing tool
The range is the interval--------> (-∞,8]

case D) 
using a graphing tool
The range is the interval--------> (-∞,-8]

 
        
             
        
        
        
What are we multiplying exactly?
        
             
        
        
        
Answer:
y=15/7x-4
Step-by-step explanation:
m=(y2-y1)/(x2-x1)
m=(11-(-4))/(7-0)
m=(11+4)/7
m=15/7
y-y1=m(x-x1)
y-(-4)=15/7(x-0)
y+4=15/7(x)
y+4=15/7x
y=15/7x-4
 
        
             
        
        
        
The answer to this equation is 1412 or 21-15