math

posted by JT

the current population of a threatened animal species is 1 million, but it is declining with a half-life of 20 years. how many animals will be left in 60 years?

1. Get Grammarly

The answer will be 177,000

2. Steve

nope. 60 years is 3 half-lives, so 1/8 will remain.

3. shelly

thank you that is also what i got. 125,000

4. Joe

I also got 125,000

Similar Questions

1. CACULUS- EXPONENTIAL GROWTH

A population of animals in an ecological niche is growing in time so that it's rate of growth dp/dt is related to its current size by the differential equation dp/dt = 900/p^2. If time is measured in years and initially there are P(0) …
2. need help

Here are five basic threats that contribute to species extinction,all of which can be influenced by our actions/choices. 1. hABITAT 2.iNVASIVE SPECIES 3.Pollution 4.Population 5.Overharvesting How have one are more of these contributed …
3. Math

Solve. The population of a particular country was 29 million in 1980; in 1989, it was 36 million. The exponential growth function A=29e^kt describes the population of this country t years after 1980. Use the fact that 9 years after …
4. Pre-Cal

The population of Las Vegas, Nevada in 2000 was 478,000 and is increasing at the rate of 6.28% per year. At this rate, when will the population reach 1 million people?
5. Chemistry

Uranium-238 has half life of 4.51 * 10^9 years Uranium-234 has half life of 2.48 * 10^5 years Thorium-230 has half life of 8.0 * 10^4 years Radium-226 has half life of 1.62 * 10^3 years Lead-210 has half life of 20.4 years. The rate …
6. science/math

write and solve an algebraic equation to find the original mass of the sample of the radioactive isotope uranium -235, which has a half-life of 704 million years your sample is about 700 million years old and weighs 120 grams
7. math

the population of a town is declining at a rate of 4.1% per year. the current population is 25000. 1)what will the population be in 7 years. 2) how long will it take the population to reach 15000?
8. college algebra

Suppose that the Russian population is declining by 0.48% each year, and continues to decline at this rate every year. a.) what is the overall 'growth' factor (really a decline factor) for 40 years of population decline?
9. Pre algebra

* There are 1,000 of an endangered species of bird left. If the population drops by 50% each year, how many years until there are only 1% of the current total left?
10. Science

Describe the two most important events in the history of animal life that occurred at the beginning and at the end of the Paleozoic era. List and briefly outline the six different periods into which the Paleozoic era is divided. Answer: …

More Similar Questions