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Which of the relations below are functions? Justify your answer.

Do all of these graphs have one output value for every input value?

  1. This is a curve graph that looks like a wave oscillating between Y = 1 and Y = 4.

    The domain of a graph is its possible -values.

    All real numbers.

    The range of a graph is its possible -values.

  1. This graph looks like a "W" with arrows on the ends pointing up and outward with turning points at (negative 1, comma 0), (1, comma 4), and (3, comma 0).

  1. This graph is a parabola or U shaped curve on its side with arrows at the end pointing right upward and right downward. The bottom of the U is at (negative 2, comma 1).

  1. For each graph above, state the domain and range.