Since the bird was already 17 feet above the water, and he dove 3 feet under, you add them to get the total distance. Anything minus a negative is equivalent to adding it, as the two negatives make a positve.
Therefore multiplying x by a number between 0 and 1 creates a horizontal stretch, which looks like a vertical compression. That is, the parabola will be shorter/wideStep-by-step explanation:
