exponential functions

[Emma101]

A culture of bacteria doubles every 20 minutes. A culture originally consisting of 200 bacteria is left to grow in a petri dish for 2 hours. What is the final number of bacteria in the petri dish after 2 hours? Explain your thought process
i need help with finding the equation i need to figure this out

 

[pka]

A culture of bacteria doubles every 20 minutes. A culture originally consisting of 200 bacteria is left to grow in a petri dish for 2 hours. What is the final number of bacteria in the petri dish after 2 hours? Explain your thought process
i need help with finding the equation i need to figure this out

The growth rate is two times each each twenty minutes. Thus each hour the colony increases by a factor of [imath] 8=2^3[/imath].
At the end of twenty-four hours how many times has the colony increased?
Now you post an answer.

 

[Steven G]

8pm: 200
8:20pm: 400
8:40pm: 800
9pm: 1600
9:20pm: 3200
9:40pm: 6400
10pm: 12800

Is there an easier to get this result?
2*2*2*2*2*2=