Grace placed 3 strands bacteria in a petri dish. the bacteria strands triple every hour. write a formula to
represent at the nth hour. then use the formula determine how many strands of bacteria are represent
at 4 hours.

a) The growth of bacteria at nth hour is :

b) At the end of the fourth hour, there are 81 stands of the bacteria    

    present.

Step-by-step explanation:

The number of initial bacteria in the dish = 3 strands

Rate at which bacteria multiply = 3 times every hour

So, the general form which represents the growth

As it multiplies three times every hour, so at nth hour:

The growth of bacteria at nth hour is :

Now, at n = 4, the growth of the bacteria is  

= 3 x 3 x 3 x 3

⇒ = 81

So, at the end of the fourth hour, there are 81 stands of the bacteria present.

answer:

c. the third graph

step-by-step explanation: