A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonymous

  • 5 years ago

last question!!! (: the company discovered that it costs $30 to produce 2 widgets, $106 to produce 4 widgets, and $670 to produce 10 widgets. Using the quadratic function, find the cost of producing 5 widgets.

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

    cost = ax^2+bx+c 30 = 4a+2b+c 106 = 16a +4b +c 670 = 100a +10b +c solve the equations to get a,b,c

  2. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    dhats got a good start for us...

  3. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    -30 = - 4a -2b -c -30 = -4a -2b -c 106 = 16a +4b +c 670 = 100a +10b +c ---------------------------------------------- 76 = 12a +2b 640 = 96a +8b

  4. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    640 = 96a +8b -608 = -96a -16b ------------------ 32 = -8b b = -4

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

    i got a = 7

  6. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    a = 76-2b//12 a = 84/12 = 7 good job....now lets hope its right :)

  7. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    30 = 4(7)+2(-4)+c

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

    One thing I don't get about these questions is why buying more in total increases the cost per thing? As far as I recall, all have been like this ... :(

  9. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    30 = 28 -8 +c 30 = 20 + c 10 = c 7x^2 -4x +10 = y should work, lets check ourselves

  10. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    economy of scale :)

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

    Economy of scale... in reverse, though, more like :/

  12. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    2,30 4,106 10,670 700 -40 +10 = 700 - 30 = 670..checks 7(16) -4(4) + 10 = 112-16+10 = 112 - 6 = 106 checks 28 -8 + 10 = 28+2 = 30 its good

  13. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    7(5)^2 -4(5) +10 = y 7(25) -20 +10 = y 175 -10 = 165 should be our answer...

  14. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    yeah....in reverse :)

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

    THANK YOU SO MUCH!!! do you have an email i could get ahold of you on? just in case i need help in other stuff.

  16. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    lol....youre welcome, but I think ill just stick to openstudy stuff ;)

  17. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    maybe widgets are one of those products that consumes more than its worth....like tribbles :)

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

    ¬_¬

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

    A Mathematica approach: let data = {{2, 30}, {4, 106}, {10, 670}} Fit[ data, {1, x, x^2}, x] /. x -> 5 yeilds 10. - 4. x + 7. x^2 =165 at x=5 The Fit function is a curve fitter.

  20. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    i never trust a machine to do a "man"s job. unless its a slide rule :)

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

    Why the quotation marks around man?

  22. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    trying to preserve my anonymity lol

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

    :(

  24. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    i try to remain androgenous online ;)

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

    As a 76 year old person who could not integrate x^2 with pencil and paper I am very impressed with amistre64 solving this thing in real time.

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

    Hmm, but which are you ¬_¬

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

    You are 76?

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

    yes.

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

    But you can integrate x^2, right?

  30. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    if i had done this with pencil and paper i would have been done long time ago.... but trying to remember which keys to press is a challange

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

    I graduated in the lower 1/3 of my class at San Jose State College as a Math major. I cannot remember all of the rules. Rather I'm using software developed by a group of World class mathematicians and computer programmers. Using Mathematic 8. The installation "file" is about 3Gb in size. By the way, Wolfram practically gives their system to students and acedemics.

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

    Hmm, intriguing. I personally find it easier to learn the rules than to learn what format to type things into Wolfram|Alpha (though maybe Mathematica is slightly easier to use). Can of course be useful at times, though.

  33. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    i just make up my own rules half the time, and guess at the the rest :)

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

    Got to go now. Thanks for the exchange.

  35. 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.