the choices are Is the number of gallons of water in the bathtub a function of time? 1) Yes because each t value is paired with
exactly one number of gallons. 2) Yes because the number of gallons is bounded between y = 0 and y = 36. 3) No because each number of gallons is paired with more than one t value. 3) No because from t = 5 to t = 20 the number of gallons of water is constant.
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