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Here is the equation, as of May 7th. I graphed the number of Swine Flu cases versus date on excel (with April 23 being Day 1). The graph was an exponential curve. In order to make a good regression, the curve has to be linear. So, I took the natural log (ln) of the cases, in order to make a near-linear graph. Then, I calculated the trendline.

# swine flu cases = e^[1.6895 + 0.3442(date)]

**Note, date = the number of the day, if you start with 4/23 as day one, 4/24 as day two, and so on. I picked 4/23 because that's when most other graphs I've seen of swine flu cases starts.

**Also note: this curve could change with time. Eventually, it will look more like a bell-curve than an exponential curve.

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Q: What is the exponential equation that models the spread of Swine Flu?
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