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trapecia [35]
3 years ago
6

Please help im lost.

Mathematics
1 answer:
8_murik_8 [283]3 years ago
8 0

Answer:

2

Step-by-step explanation:

h(t) =  - 16 {t}^{2}  + 64 \\ \Leftrightarrow 0 =  - 16 {t}^{2}  + 64 \\ \Leftrightarrow  {t}^{2}  = 4\Leftrightarrow t =  \pm2\Leftrightarrow t = 2 \: (t  \geqslant 0)

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