Rewrite y=3(8)^{t/15} in the form y=a(1+r)^t or y=a(1-r)^t .Round the value of r to the nearest ten thousandth. Then tell whether the model represents exponential growth or exponential decay.

Yesterday, george drank 1 small bottle and 2 large bottles, for a total of 1,372 grams. the day before , he drank 1 small bottle and 1 large bottle, for the total of 858 grams. how many grams does each bottle hold?