Respuesta :

234.375 or about 234. 
Half it several times to get the answer.
15000/2=7500 (1 hour ago)
7500/2= 3750 (2 hours ago)
3750/2= 1875 (3 hours ago)
1875/2=937.5 (4 hours ago)
937.5/2= 468.75 (5 hours ago)
468.75/2= 234.375 (6 hours ago)
Therefore, there were 234.375 or about 234 bacteria 6 hours ago.

There were 234 bacteria 6 hours ago

How to determine the number of bacteria?

The given parameters are;

Presently, a = 15000

Rate, b = 2

The function is an exponential function, and it is represented as:

f(x) = ab^x

This gives

f(x) = 15000 * 2^x

6 hours ago, the value of x is

x = -6

So, we have:

f(-6) = 15000 * 2^(-6)

Evaluate

f(-6) = 234

Hence, there were 234 bacteria 6 hours ago

Read more about exponential functions at:

https://brainly.com/question/11464095

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