A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonymous

  • 5 years ago

when making a long distance call from a cetain pay phone, the first three minutes of a call cost $2.25. After that, each additional minute or portion of a minute of that call costs $0.30. Using the inequality C is greater than or equal to 2.25+0.30(X-3)where C is the total cost and X is the number of minutes, find the number of minutes one can call long distance for $4.35. Please show the work so i can do it.

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

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

    ^^please help me on this assignment. Please show the work so i can know how to do it. Thanks

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

    well you already have the equation: C=2.25+0.30(X-3).. that means you can get the cost for known number of minutes and vice versa

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

    so just substitute for C=4.35 (the cost) to get the number of minutes, that's: 4.35=2.25+0.30(X-3).. just solve the equation for X.

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

    \[4.35=2.25+0.30(X-3) \implies 0.30(X-3)=4.35-2.25\] \[\implies 0.30(X-3)=2.1 \implies X-3=7 \implies X=10\]

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

    10 minutes is the answer you're looking for :)

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

    does that make sense to you?

  8. 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.