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shelby1290

  • one year ago

Mini flares are used by some boaters in an emergency. The flight of a flare, when fired at an angle of 70 degrees to the horizontal, is modelled by the function: h(t) = -9(t-3)^2+83 where h is the height, in metres, and t is the time, in seconds, since the flare was fired. a) What is the maximum height of the flare? b) After how many seconds does the flare reach its maximum height? c) For how many seconds does the flare burn before it hits the ground? d) State the domain and range of the function

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  1. shelby1290
    • one year ago
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    I've already done part a) and b) a) 83 m b) 3 seconds

  2. dan815
    • one year ago
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    I think instead of just giving you the answer the best way i can help you is with thsi

  3. dan815
    • one year ago
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    |dw:1443151264223:dw|

  4. dan815
    • one year ago
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    you have a parabola here, when you have height zero it passed through the x axis

  5. dan815
    • one year ago
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    h(t) = -9(t-3)^2+83 h(t)=0 what must the time be

  6. dan815
    • one year ago
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    |dw:1443151429045:dw|

  7. shelby1290
    • one year ago
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    am i substituting 0 for t?

  8. dan815
    • one year ago
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    no height is 0, we have to time the t, or the time when it is

  9. dan815
    • one year ago
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    h(t) = -9(t-3)^2+83 h(t)=0 0=-9(t-3)^2+83 solve for t

  10. shelby1290
    • one year ago
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    |dw:1443151642697:dw|

  11. shelby1290
    • one year ago
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    @dan815 i feel like i'm doing everything wrong ^

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