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12-38.

Match each function with its graph.

  1. Repeating wave curve, first visible approximate, low & high points: (negative 5, comma negative 3) & (negative 4, comma 3), continuing in that pattern, just past 5.

  1. Repeating wave curve, first visible approximate, low & high points: (negative 5, comma negative 2) & (negative 4, comma 0), continuing in that pattern, just past 5.

  1. Repeating wave curve, first visible approximate, low & high points: (negative 3, comma negative 4) & (0, comma 2), continuing in that pattern, just past 5.

  1. Repeating wave curve, first visible approximate, high & low points: (negative 5, comma 3) & (negative 2, comma negative 3), continuing in that pattern, just past 5.

(a) is ii
(c) is iv