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Roberto has been studying a type of bacteria that doubles every month. Originally, there were 3 bacterial cells. He wants to know how many there will be after 43 months. Which equation should he use?

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a43 = 3(2)(43)
a43 = 3(2)^43
a43 = 3(2)(43 − 1)
a43 = 3(2)^43 − 1

those are the answer choices

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