An air freshener starts with 21 grams and evaporates. In each of the following cases, write a formula for the quantity, Q grams, of air freshener remaining t days after the start. (a) The decrease is 4 grams per day. Q(t) = (b) The decrease is 6% per day. Q(t) = (c) The decrease is at a continuous rate of 8% per day. Q(t) =

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