We cannot divide by zero. Since x is the average price per favor, we regar x as a positive quantity. Thus, eliminate the first choice (x<0).
For positive x, the curve is a parabolic shape with its vertex near to (0,0). If x approaches 0 from the right, y increases without bound. Note that x cannot be either zero or negative. As x approaches infinity, 50/x approaches infinity (has no upper bound in theory).
We have to take that +3 into account. For every input x value, there will be a corresponding y value. To this y, in every case, add 3.
The range will be (3, infinity). Again, this is "in theory." The # of party favors that can be purchased is certainly nowhere near infinity. What would be a reasonable answer to this "range" question?
