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anonymous

  • 5 years ago

A company discovers that it costs $18 to produce 2 calculators, $66 to produce 4 calculators, and $450 to produce 10 calculators. Using quadratic functions, find the total cost of producing 8 calculators.

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  1. anonymous
    • 5 years ago
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    yes. i just checked over it again to make sure.

  2. amistre64
    • 5 years ago
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    (2,18) (4,66) (10,450) b = (18-66)(100-4) + (450-18)(16-4) ------------------------------ (2-4)(100-4) + (10-2)(16-4)

  3. amistre64
    • 5 years ago
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    b = (-48)(96) + (432)(12) ------------------- (-2)(96) + (8)(12)

  4. amistre64
    • 5 years ago
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    b = -4608 + 5184 576 ------------- = ---- = -6 -192 + 96 -96 b = -6

  5. amistre64
    • 5 years ago
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    (2,18) (4,66) (10,450) a = (66-18) (4-2)(6) ------- - ----- (16-4) (16-4) a = 48 12 36 ---- - ----- = ----- = 3 12 12 12 a = 3; b = -6

  6. amistre64
    • 5 years ago
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    c = 18 - 4(3) - 2(-6) c = 18 -12 +12 = 18 3x^2 -6x +18 let me double check that

  7. anonymous
    • 5 years ago
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    i really have no idea how you remember all those steps!! this would so much easier with a graphing calc!

  8. amistre64
    • 5 years ago
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    lol... thats ok, i have to redo it :) im gonna work it out on the paper, itll just be easier for me :)

  9. anonymous
    • 5 years ago
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    Graphing calculators are for babies.

  10. anonymous
    • 5 years ago
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    graphing calculators are for people who really don't like math & like to take the easy way to get it done with faster.

  11. anonymous
    • 5 years ago
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    well if i would've found that or someone would've gave me the site, i would use it. but they didn't so i couldn't.

  12. anonymous
    • 5 years ago
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    amistre... ready?

  13. amistre64
    • 5 years ago
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    its 1:45 am here and my brain aint behaving itself ....sorry racer, maybe tomorrow :)

  14. anonymous
    • 5 years ago
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    this is the last question & i'll be done..

  15. anonymous
    • 5 years ago
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    Do you want me to do it?

  16. anonymous
    • 5 years ago
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    well it's too late now. i thought i would be able to figure out the answer from what she gave me. but it was wrong & i could only miss 1 out of 5.

  17. anonymous
    • 5 years ago
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    OK... later

  18. anonymous
    • 5 years ago
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    thanks though. guess i'll try again tomorrow.

  19. amistre64
    • 5 years ago
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    After some sleep, I see where I went wrong :) b=-6 is good, but when I used it down here I made it "+6".....which of course threw off my numbers.... (2,18) (4,66) (10,450) a = (66-18) (4-2)(-6) <-- right there ------- - ----- (16-4) (16-4) a = 48 -12 60 ---- - ----- = ----- = 5 12 12 12 a = 5; b = -6 ; now THOSE are the right numers :)

  20. amistre64
    • 5 years ago
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    c = 18 -4(a) - 2(b) c = 18 - 4(5) - 2(-6) c = 18 -20 +12 c = 30 - 20 c = 10 y = 5x^2 -6x +10 is the good equations. y = 5(8)^2 -6(8) +10 y = 5(64) -48 +10 y = 320 -38 y = 282 the cost of 8 calculator costs $282

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