Answer: 18
Step-by-step explanation:
2 degrees per hour
9 hours 
1hour = 2 degrees
2hours= 4 degrees
3hr= 6 degrees
4hr= 8 degrees
5hr=10 degrees
6hr= 12 degrees 
7hr= 14 degrees 
8hr= 16 degrees 
9hr= 18 degrees 
So you are basically doing 2x9 to get your answer 
 
        
             
        
        
        
Answer:
-4 1/2 or -4.5 or -9/2
Step-by-step explanation:
 
        
             
        
        
        
For a quadratic of the form 

, we have the quadratic formula 

,
where a is the coefficient (number before the variable) of the squared term, b is the coefficient of the linear term, and c is the constant term.
So, given 

, we can get that 

, and 

. We substitute these numbers into the quadratic formula above.





This is our final answer.
If you've never seen the quadratic formula, you can derive it by completing the square for the general form of a quadratic. Note that the 

 symbol (read: plus or minus) represents the two possible distinct solutions, except for zero under the radical, which gives only one solution.
 
        
             
        
        
        
Man why you asking us like we know