Quantcast

A community for students. Sign up today!

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

greeneyes<3

  • 2 years ago

You buy a computer for $1200. The value of the computer decreases by 30% each year. Find the value of the computer after 4 years. Please show work! Thanks!

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

    Let c = value of computer in dollars. Let t= the number of years \[c=1200e ^{-.3t}\]\[c=1200e ^{-.3(4)}\] c= $361.43

  2. greeneyes<3
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Thanks the only thing is that my teacher got the answer: $288.12

  3. greeneyes<3
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Sometimes he is wrong though...

  4. marshallinwashington
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    He probably using a linear equation instead of an exponential. Have you discussed logarithms?

  5. greeneyes<3
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    We did logarithms about 2 months ago.

  6. marshallinwashington
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Check back a little while and I'll see if I can come up with the linear equation

  7. greeneyes<3
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    okay you can take your time :) really, thanks for helping me. It does mean a lot. :)

  8. marshallinwashington
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    It's not a linear equation, but an exponential equation. \[c=1200(.7)^{t}\] So for t=4 years \[c=1200(.7)^{4}\] Which gives us $288.12 The difference between the first equation I wrote and the new one is that in the first one the computer lost value continuously.

  9. greeneyes<3
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Thank you so much!!! ^_^

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

    • Attachments:

Ask your own question

Ask a Question
Find more explanations on OpenStudy

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.