Question

A bacteria culture begins with 4 bacteria which double in size every hour. How many bacteria exist in the culture after 8 hours?

128
256
1,024
8,192

Answer 1

Let me make it clear,

The bacteria culture begins with 4 bacteria and double up every hour. And the hours given is 8 hours.

Therefore, we can first list the equation: 4 x 2^8

And we can get the solution 1024 <- Answer

Hope it helps

Answer 2

4 Bacteria double per hour to give 8 bacteria then in 8 hours it will become 64 then this 64 doubles to give us 128