To begin a bacteria study, a petri dish had 2300 bacteria cells. Each hour since, the number of cells has increased by 9.3%.

Let t be the number of hours since the start of the study. Let y be the number of bacteria cells.

Write an exponential function showing the relationship between y and t.

The formula for exponential growth is:

Total = starting value x (1 + rate)^ time

Using the information in the problem the formula would be:

y = 2300(1.093)^t

she played for 18.75 hours.

step-by-step explanation:

if she played 2/4 of a hour on tuesday. and there is 60 minutes in an hour and 60 divided by 4 is 7.5. and she played 2/4 of an hour on thursday then again 60 divided by 4 is 7.5, you add 7.5+7.5=56.25. now you have to do 1/4 of an hour, it equals 3.75. now you have to add them all up. 3.75+7.5+7.5=18.75

i hope this and i hope you get it right. it took me a while to get this done for you. : )