hard · SAT Math

A biology class models bacterial growth in a petri dish. The table shows the bacteria count y at each hour x after the start of the experiment, where x increases by 1 hour each row. x (hours): 0 1 2 3 y (count): 40 80 160 320 Assume the pattern shown continues. What is the bacteria count at hour 4?

1. 160
2. 480
3. 640
4. 1280

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