# math

Brett has been studying a type of bacteria that doubles every month. Originally, there were 5 bacterial cells. He wants to know how many there will be after 42 months. Which equation should he use?

a42 = 5(2)42 − 1

a42 = 5(2)(42)

a42 = 5(2)42

a42 = 5(2)(42 − 1)

1. 👍 0
2. 👎 0
3. 👁 1,133
1. originally when n = 0, y = 5
after one month, n = 1 and we should have ten
so
y = 5 * 2^n
after 42 months
y = 5 * 2^42

1. 👍 0
2. 👎 0
posted by Damon

## Similar Questions

1. ### math

A type of bacteria doubles in number every 12 hours. After 2 days, there are 48 bacteria. How many bacteria were there at the beginning of the first day.

asked by Taylor on November 13, 2013
2. ### math

A type of bacteria doubles in number every 12 hours. After 2 days, there are 48 bacteria. How many bacteria were there at the beginning of the first day. I know the answer is 3, but want to know how it arrived at the number "3"

asked by Taylor on November 13, 2013
3. ### Physics

On earth, a certain type of bacteria doubles in number every 24 hours. Two cultures of these bacteria are prepared, each consisting initially of one bacterium. One culture is left on earth and the other is put on a rocket

asked by Joe Schmo on May 25, 2011
4. ### Math

In a laboratory, a certain culture of bacteria doubles every hour. If there are originally 20 bacteria in the culture, how many are present after 10 hours? 11 hours?

asked by Lan Pas on July 25, 2017
5. ### Pre-Calculus

The population of a particular type of bacteria doubles in number every 12 hours. a)if there are 8 bcteria initially, write an equation that models the number of bacteria present after x 12 hours. b)How many bacteria will be

asked by Amy on December 21, 2009
1. ### Math

In a lab experiment, the count of a bacteria doubles every hour. a)at 1pm, there was 23000 bacteria. How many bacteria will be present at midnight? I can't seem to get the correct answer. The answer is 47 104 000 bacteria. Thanks

2. ### precalculus

A bacteria culture initially contains 1500 bacteria and doubles every half hour. a) Find an expression for the number of bacteria after t hours. Q(t)= b) The number of bacteria after 20 minutes is (the answer must be an integer)

asked by josh on March 2, 2011
3. ### math

7. A certain strain of bacteria doubles every 6 minutes. Assuming that you start with only one bacterium, how many bacteria could be present at the end of 84 minutes (round answer to the nearest bacteria)?

asked by amy on November 9, 2016
4. ### Science

A bacteria culture has an initial population of 200 bacteria at 9:00 AM and, in the presence of sufficient nutrients, the population doubles every 25 minutes. At approximately what time will there be 100,000 bacteria?

asked by Kim on July 3, 2019
5. ### calculus

A bacteria culture starts with 900 bacteria and the population doubles every 4 hours. Find an expression for the number of bacteria after t hours.

asked by Anonymous on November 5, 2010

More Similar Questions