Which of the following represents the number of bacteria, $y$, in the…

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The number of bacteria in a liquid medium doubles every day. There are 72,000 bacteria in the liquid medium at the start of an observation.

Which of the following represents the number of bacteria,

y

, in the liquid medium

t

days after the start of the observation?

y = \frac{1}{2} (72, 000)^{t}

y = 2 (72, 000)

y = 72, 000 (\frac{1}{2})^{t}

y = 72, 000 (2)^{t}