Answer:
C) They are perpendicular lines. 
Step-by-step explanation:
We first need to find the slope of the graph of the lines passing through these points using:

The slope of the line that passes through (−12, 15) and (4, −5) is 


The slope of the line going through (−8, −9) and (16, 21) is



The product of the two slopes is

Since

the two lines are perpendicular.
 
        
                    
             
        
        
        
Answer:
0.002M
Step-by-step explanation:
2.7= -log(H^+)
-2.7=log(H^+)
10^-2.7 M=H^+
0.0002M=H^+
 
        
             
        
        
        
Answer:
Simple,the answer would be 93200
Step-by-step explanation:
You move your decimal point backwards by the power e.g 10^6 u move backwards 6 times
 
        
             
        
        
        
The error is that 9 shouldnt be written as nine it should be written as 3x3 or 3^2. So the answer should be 2^3 x 3^2 because 9 can be divided into even more prime factors of 72.
 
        
                    
             
        
        
        
Answer:
11/2
Step-by-step explanation:
Multiply by 2/2 to remove the decimal.