Marco is draining his two aquariums. The tanks are the same size. One tank has 7 in. of water in it, and it is being drained at
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Each term is half of the previous one, so the common ratio is 1/2. Then to get from the first term to the nth term, you have to take n - 1 steps, multiplying by 1/2 each time and by 6000 to account for the first term.
i hope this helps! :D