Quantcast

A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

JamenS

  • 2 years ago

In 1987, the Australian humpback whale population was 350 and has increased at a rate of about 14% each year since then. Write a function to model population growth. Use a graph to predict when the population will reach 20, 000.

  • This Question is Closed
  1. Traxter
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Use the compound interest formula you used in the other question.

  2. JamenS
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    sooo wud it b 350(1+1.014)=20000

  3. Traxter
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Almost, the graph you will draw is 350(1+0.014)^n. Then you will go to the point where the graph equals 20,000 and see how many years it has been.

  4. JamenS
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    290.9?

  5. Traxter
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    290.99 is the correct answer, did you solve it using the graph?

  6. JamenS
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    no im not sure how 2 graph it

  7. Traxter
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    http://www.wolframalpha.com/input/?i=350%281.014%29^n+from+-1+to+300

  8. JamenS
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    a)P(t) = 350(1.14)t; the population will reach 20,000 in about 30.9 yr. b)P(t) = 350(0.86)t; the population will reach 20,000 in about 19.5 yr. c)P(t) = 350(0.86)t; the population will reach 20,000 in about 39.1 yr.wwwwww d)P(t) = 350(1.14)t; the population will reach 20,000 in about 25.6 yr.

  9. Traxter
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Sorry, 290.99 is not the correct answer at all. The interest is 14% (which is 1.14), not 1.4% (which is 1.014). If you put 1.14 into the formula instead of 1.014 you should get the correct answer. Let me know how it goes.

  10. JamenS
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    wud it b A?

  11. JamenS
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    30.8?

  12. Traxter
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    The answer on my calculator is 30.87543347. The correct rounding of this to one decimal place is 30.9. So the answer is A.

  13. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.