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emmynimmy

  • one year ago

The equation y = –5.131x2 + 31.821x – 3.333 approximates the number of people standing in line to catch a commuter train x hours after 5 a.m. What is the best estimate for the number of people in line at 8 a.m.?

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  1. anonymous
    • one year ago
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    8 is apparently 3 hours after 5 right?

  2. emmynimmy
    • one year ago
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    77 46 40 32

  3. emmynimmy
    • one year ago
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    those are the choices.

  4. emmynimmy
    • one year ago
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  5. anonymous
    • one year ago
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    whatever, as the kids say replace \(x\) by \(3\) use a calculator i use this http://www.wolframalpha.com/input/?i=+%E2%80%935.131*3^2+%2B+31.821*3+%E2%80%93+3.333

  6. emmynimmy
    • one year ago
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    Thanks! Can you help with the second one?

  7. anonymous
    • one year ago
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    lol how?

  8. anonymous
    • one year ago
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    this requires some some of program or way way more arithmetic than i can do we can cheat though

  9. anonymous
    • one year ago
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    some *sort

  10. emmynimmy
    • one year ago
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    i mean do you know the answer?

  11. anonymous
    • one year ago
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    no let me try to use wolfram

  12. emmynimmy
    • one year ago
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    okay thanks.

  13. anonymous
    • one year ago
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    don't say i never did anything for you note the syntax of what i wrote in wolfram http://www.wolframalpha.com/input/?i=quadratic+%282%2C10.1%29%2C%284%2C7.3%29%2C%286%2C5.9%29%2C%287%2C5.1%29%2C%2811%2C6.3%29%2C%2812%2C8.2%29%2C%2815%2C8.8%29

  14. anonymous
    • one year ago
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    looks like the last one we could have guessed actually, i can tell you how if you like

  15. emmynimmy
    • one year ago
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    thank you so much!

  16. emmynimmy
    • one year ago
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  17. emmynimmy
    • one year ago
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    i don't know how to work the wolf thing so thats why im asking you to do them (:

  18. anonymous
    • one year ago
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    how the hell are you supposed to do this?

  19. emmynimmy
    • one year ago
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    i have no idea, and this is supposed to be the "easiest" math.

  20. anonymous
    • one year ago
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    only the last two make sense the first two are not in the right form i would guess C cause when in doubt, Charlie out, but i guess we can try something this stuff is for computers

  21. emmynimmy
    • one year ago
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    should i go ahead and answer?

  22. anonymous
    • one year ago
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    no!!

  23. anonymous
    • one year ago
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    it decreases, so the base has to be less than one it is the last one by process of elimination

  24. emmynimmy
    • one year ago
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    yay thank you now lets see if they're right..

  25. emmynimmy
    • one year ago
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    yep! awesome thanks.

  26. anonymous
    • one year ago
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    yw

  27. anonymous
    • one year ago
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    hope you are done!

  28. emmynimmy
    • one year ago
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    I have a practical math test and a geometry test but i honestly feel so sick and i hate math so i can't even do them right now.

  29. anonymous
    • one year ago
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    yeah put it off

  30. anonymous
    • one year ago
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    "practical math" lol

  31. anonymous
    • one year ago
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    you familiar with chuck berry?

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