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Y_Kistochka [10]
3 years ago
5

Plz help meh

Mathematics
1 answer:
dusya [7]3 years ago
8 0

Answer:

Step-by-step explanation:

The rock will hit the surface when its height equals zero.

t^2-8t-10=0

t^2-8t=10

t^2-8t+16=10+16

(t-4)^2=26

t-4=+(26^(1/2))

t=4+(26^(1/2))

t=9.1s

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