Answer:
 First option:  
 Second option: 
 Fourth option: 
 
Step-by-step explanation:
  Rewrite each equation in the form  and then use the Discriminant formula for each equation. This is:
 and then use the Discriminant formula for each equation. This is:
 
 1) For  :
:
  
 Then:
  
 
 Since  this equation has no real solutions, but has two complex solutions.
 this equation has no real solutions, but has two complex solutions.
 2) For  :
:
  
 Then:
  
 
 Since  this equation has no real solutions, but has two complex solutions.
 this equation has no real solutions, but has two complex solutions.
 3) For  :
:
  
 Then:
  
 
 Since  this equation has one real solution.
 this equation has one real solution.
 4) For  :
:
   
 
 Then:
  
 
 Since  , this equation has no real solutions, but has two complex solutions.
, this equation has no real solutions, but has two complex solutions. 
 
        
             
        
        
        
Answer:
B multiplying by 
Step-by-step explanation:
Multiple is opposite from divide.
Plus is opposite from subtract.
 
        
             
        
        
        
Answer:
Well, I think that the 50% coupons would give you only 50% off of your entire purchace. Not 100% off.
Step-by-step explanation:
 
        
             
        
        
        
Answer:
Step-by-step explanation:
1. ok so you need to use Pythagoras which is a^2 + b^2 = c^2
substituting 16 and 12 into 'a' and 'b' you get 16^2 + 12^2 = c^2
256 + 144 = c^2
400 = c^2 (square root each side to get ride of the square)
c = 20cm
2. doing the same thing you get c = 22.36 in
3. again doing it you get c = 15Ft
  Hope this helps!