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18 April, 07:51

Alain throws a stone off a bridge into a river below.

The stone's height (in meters above the water), x seconds after Alain threw it, is modeled by:

h (x) = - 5x^2 + 10x + 15

How many seconds after being thrown will the stone hit the water?

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Answers (1)
  1. 18 April, 09:51
    -1
    the answer is 3 seconds
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