The ratio 1:2 means there are twice as many dimes as there are quarters.  An expression could be n=2d, n being number of quarters, d being number of dimes.
        
             
        
        
        
X^2+y^2 = 16 
can be written as 
(x-0)^2+(y-0)^2 = 4^2
We see that the second equation is in the form
(x-h)^2 + (y-k)^2 = r^2
where
(h,k) = (0,0) is the center
r = 4 is the radius
The polar form of the equation is simply r = 4. Why is this? Because the radius is fixed to be 4 no matter what happens with theta. As theta goes from 0 to 360, the points generated all form a circle centered at (0,0) with radius 4. 
Answer: r = 4
        
             
        
        
        
Answer:
4 3/4
Step-by-step explanation:
Just multiply 1 3/4 and 3 = 4 3/4
 
        
             
        
        
        
9514 1404 393
Answer:
   no solution
Step-by-step explanation:
The discriminant is ...
   b^2 -4ac = (-4)^2 -4(2)(16) = 16 -128 = -112
A negative discriminant means there are no real solutions to the equation.
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The complex solutions are 1±i√7.
If we assume the equation has a typographical error and is intended to be ...
   2x^2 -4x -16 = 0
The solutions are x = -2 and x = 4.