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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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
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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I've already done part a) and b) a) 83 m b) 3 seconds
I think instead of just giving you the answer the best way i can help you is with thsi
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Other answers:

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

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