OK my friend if you times 15 by each of the amount of hours you will find out which one it is but in this case it will be 15 times 6 hours will equal out to be $90
        
                    
             
        
        
        
It is both equations are equal to -0.076.
        
             
        
        
        
Maybe 6 dollars? Sorry if i'm wrong :(
        
                    
             
        
        
        
I cant see the location of the star can u please take another picture of the question
        
             
        
        
        
The value of b is 
Explanation:
The given quadratic equation is 
And has x - intercept 
To determine the value of b, let us substitute the coordinates  in the given quadratic equation
 in the given quadratic equation 
Substituting the x - intercept in the equation  , we have,
, we have,

Simplifying, we have,


Adding the constant terms, we get,

Subtracting both sides by 10, we have,

Dividing both sides by -2, we get,

Hence, the value of b is 