Which statement and reasoning is true about the decimals 0.4 and 0.06? circle the letter of all that apply

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The height of a flare fired from the deck of a ship in distress can be modeled by h(t)= -2(8t^2-52t-28), where h is the height of the flare above water and t is the time in seconds. a. find the time it takes the flare to hit the water.

How is this equation completed? i cannot find any examples in the book.