shelby1290
  • shelby1290
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
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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shelby1290
  • shelby1290
I've already done part a) and b) a) 83 m b) 3 seconds
dan815
  • dan815
I think instead of just giving you the answer the best way i can help you is with thsi
dan815
  • dan815
|dw:1443151264223:dw|

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dan815
  • dan815
you have a parabola here, when you have height zero it passed through the x axis
dan815
  • dan815
h(t) = -9(t-3)^2+83 h(t)=0 what must the time be
dan815
  • dan815
|dw:1443151429045:dw|
shelby1290
  • shelby1290
am i substituting 0 for t?
dan815
  • dan815
no height is 0, we have to time the t, or the time when it is
dan815
  • dan815
h(t) = -9(t-3)^2+83 h(t)=0 0=-9(t-3)^2+83 solve for t
shelby1290
  • shelby1290
|dw:1443151642697:dw|
shelby1290
  • shelby1290
@dan815 i feel like i'm doing everything wrong ^

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