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anonymous

  • 5 years ago

can i get some help from anyone dats good wit word problems

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  1. anonymous
    • 5 years ago
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    Write your question down!!

  2. anonymous
    • 5 years ago
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    (h(t)=-16t^2+vt+c where h is the approximate height in ft t is the time in motion in seconds v is the initial upward velocity in ft per second and c is the initial height in ft) A baseball player hits a pitched ball when it is 4ft above the ground the initial upward velocity is 80ft/s how long will it take for the ball to hit the ground???

  3. anonymous
    • 5 years ago
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    Consider the given equation h(t)=-16t^2+vt+c. We are looking to find t, where v=80ft/s and c=4ft. h(t) represents the height when it hits the ground, that's h(t)=0. So: \[0=-16t^2+80t+4 \implies -4t^2+20t+1=0 \] Now solve the quadratic equation for t. Take only the positive value.

  4. anonymous
    • 5 years ago
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    how did u get the 2nd equation

  5. anonymous
    • 5 years ago
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    Divide both sides by 4.

  6. anonymous
    • 5 years ago
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    ok so how do i get t

  7. anonymous
    • 5 years ago
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    Use the quadratic formula. You will positive value t approximately 5.05 sec.

  8. anonymous
    • 5 years ago
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    will get*

  9. anonymous
    • 5 years ago
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    only answers it could be is 3s,4s or 2.2s cuz its one of those riddle papers

  10. anonymous
    • 5 years ago
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    Let me check my answer.

  11. anonymous
    • 5 years ago
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    i though 4 was h

  12. anonymous
    • 5 years ago
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    >.< I don't know why 5 is not among the choices.

  13. anonymous
    • 5 years ago
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    im trippen it is 5.1 on here can u tell me how i can get it cuz idk how 2 do dis

  14. anonymous
    • 5 years ago
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    5.1 is there and you didn't say that? >.<

  15. anonymous
    • 5 years ago
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    yes and i didnt notice till i looked at the riddle paper

  16. anonymous
    • 5 years ago
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    :( I redid it like 6 times.

  17. anonymous
    • 5 years ago
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    im sorry

  18. anonymous
    • 5 years ago
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    can u still help me

  19. anonymous
    • 5 years ago
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    lol it's ok.. what is it that you don't understand?

  20. anonymous
    • 5 years ago
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    after i get t=-4t^2+20t+1 what do i do

  21. anonymous
    • 5 years ago
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    You just solve the equation for t. Are you allowed to use a calculator?

  22. anonymous
    • 5 years ago
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    yes

  23. anonymous
    • 5 years ago
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    but how u solve 4 t

  24. anonymous
    • 5 years ago
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    Okay, you can solve it by your calculator.

  25. anonymous
    • 5 years ago
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    i need steps

  26. anonymous
    • 5 years ago
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    \[t={-b \pm \sqrt{b^2-4ac} \over 2a}={-20\pm \sqrt{20^2+16} \over -8}\]

  27. anonymous
    • 5 years ago
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    or you can just write the equation in your calculator and it will give you the answer directly.

  28. anonymous
    • 5 years ago
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    i remember dat fromula but where u get -20 and -8

  29. anonymous
    • 5 years ago
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    a=4, b=20, c=1. Plug them in the equation.

  30. anonymous
    • 5 years ago
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    ok u have 2 understand i got like 11 more problems to do and im not understanding where u getting these numbers 4rm when it comes 2 math i gotta be talked 2 like im slow so i can pick it up quick u have 2 explain how u got a b c from dat word problem the only numbers i got from the equation is -16 80 and 4 so please explain

  31. anonymous
    • 5 years ago
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    okay, then take a=-16, b=80 and c=4. That will work exactly the same.

  32. anonymous
    • 5 years ago
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    y u make it so difficult u like my teacher just tell me the simple answer lol so do i use dat equation 4 all these problems

  33. anonymous
    • 5 years ago
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    hmm okay focus now.

  34. anonymous
    • 5 years ago
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    You told me you got the first equation. This is a quadratic equation, it can always be solved by the quadratic formula, which I wrote above. The question now is what a, b and c.

  35. anonymous
    • 5 years ago
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    ok hold on dis cant go in my calculator when it has the +-

  36. anonymous
    • 5 years ago
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    a is the coefficient of t^2, b is the coefficient of t, and c is the constant.

  37. anonymous
    • 5 years ago
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    just do it once with the minus, and another time with the plus.

  38. anonymous
    • 5 years ago
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    and then take from the two final answers, the positive one.

  39. anonymous
    • 5 years ago
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    wat was wrong with the formula they gave me dis is pissing me off

  40. anonymous
    • 5 years ago
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    I don't know!

  41. anonymous
    • 5 years ago
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    ok look can u tell me how to do it just using the formula they gave me i dont like dat other one it wont go in my calculator and im getting way 2 mad 2 focus

  42. anonymous
    • 5 years ago
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    I just told you. can you please help here, at least by reading what I write?

  43. anonymous
    • 5 years ago
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    i did read wat u wrote but u not giving me step by step instructions may be natrual 2 u but it aint 2 me im good but slow at it so all i need is someone 2 break it down one good time instead of giving me alot of info without working it completly out

  44. anonymous
    • 5 years ago
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    Where exactly is your problem?

  45. anonymous
    • 5 years ago
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    i dont know how to use h(t)=-16t^2+vt+c

  46. anonymous
    • 5 years ago
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    whoops you mean the very beginning? I don't think I can help you here. I am a little bit busy. I am so sorry. I really tried, but I might be not good at explaining things.

  47. anonymous
    • 5 years ago
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    ook

  48. anonymous
    • 5 years ago
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    Good luck!! :)

  49. anonymous
    • 5 years ago
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    i keep getteing 50.9 i finally figured out wat u was saying

  50. anonymous
    • 5 years ago
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    Good to know that :)

  51. anonymous
    • 5 years ago
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    can u help me e 5.1 answer cuz i guess im putting dis in the calculator wrog im not getting 5.1

  52. anonymous
    • 5 years ago
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    once i use the formula u gave me is there a step after dat 2 get the 5.1

  53. anonymous
    • 5 years ago
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    No, you have just to use your calculator correctly. Better to take it step by step, like start with the part under the square root.

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spraguer (Moderator)
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