Look up traffic rules on whatever state you live in and it will tell you everything :) not much of an answer but thats all i have <3
There are several information's of immense importance already given in the question. Based on those information's the answer can be easily deduced.
Initial number of bacteria in the culture = 1000
Number of bacteria after t hours = 1000 (2)^t
Then
1000 (2)^t = 50000
2 ^t = 50
t = 5.6
I hope the procedure is clear enough for you to understand.
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We need to see our answer choices to check all that apply.