Mathematics, 01.12.2021 01:00 jeremiaht7

Cameron launches a toy plane from the roof of the school building, which is 84 feet high. The plane's height above the ground is modeled by the function .h=-16t^2+32t+84
d) Unfortunately, Cameron's plane took a nosedive and crash-landed on the ground. Always looking on the bright side, Cameron decided to figure out how long his plane was in the air before it crash-landed.
How long was Cameron plane in the air before it crash-landed? you MUST clearly explain all the steps you took to find the solution
Plz give a good step by step explanation

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Cameron launches a toy plane from the roof of the school building, which is 84 feet high. The plane'...