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a zombie apocalypse begins when 4 zombies break free from a secret government lab. Each zombie can infect (and thus zombify) 2 people per day on average. write an equation to represent the number of zombies that would exist after d days,

The population of texas in 2016 is 6,641,480. Find the number of days it would take to infect the entire state if this happened in texas. SHOW YOUR WORK.