A recipe for making popcorn requires 2 tablespoons of butter for every cup of popcorn kernels. At this rate, how much butter is
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The answer is what I have attached as an image. There are two ovals. The oval on the left is the input oval with the numbers -2, -1, 3 and 6 inside. There are arrows connecting those values to the number -4 in the other oval, which is the set of outputs. This relation is a function. The reason why is because each input leads to exactly one output.
