I would say it is A because if you subtract <em>p,</em> the original price by $2.50, you would get <em>d, </em>the discounted price. Look at B u see that you're adding the discount which doesn't make sense. Looking at C, the discounted price of different prices can't always be the same. And finally, D, the discounted price is greater than the original. Also, if you subtract you would get different discounts.
        
             
        
        
        
The line is called the directrix.  Here we have a vertical directrix, so a parabola sideways from usual.
Geometry is best done with squared distances.  The squared distance from an arbitrary point (x,y) to the vertical line x=2 is 

We equate that to the squared distance of (x,y) to the focus (-2,0): 



We could call that done.  A more standard form might be
 
 
        
        
        
Answer: 36
Step-by-step explanation:
 (Triangle ABC is isosceles)
 (Triangle ABC is isosceles)
 (base angles of an isosceles triangle are congruent)
 (base angles of an isosceles triangle are congruent)
 (In triangle CMB, angles in a triangle add to 180 degrees)
 (In triangle CMB, angles in a triangle add to 180 degrees)
 (triangle sum theorem)
 (triangle sum theorem)
 (30-60-90 triangle CMB)
 (30-60-90 triangle CMB)
 (sides opposite congruent angles in a triangle are congruent)
 (sides opposite congruent angles in a triangle are congruent)
 (segment addition postulate)
 (segment addition postulate)
 
        
             
        
        
        
Answer: 1.5 or 1 1/2
Step-by-step explanation:
 
        
                    
             
        
        
        
Step-by-step explanation:
hope I understand your qyestion
Equation 1 : R+G=20
Equation 2 : 7R+3G=9
Multiply Equation by 3, it becomes
3R+3G=60 ...... Equation 3
Now Equation 3 minus Equation 2
-4R = 51
R = - 51/4
Sub R into Equation 1, you can find G