A pilot of a helicopter plans to release a bucket of water on a forest fire. The height y in feet of water t seconds after its release is modeled by y = − 16 t 2 − 2 t + 400 . How long will it take for the water to reach the ground? Round to one number after the decimal point.

4.93 seconds

Step-by-step explanation:

The height y in feet of water t seconds after its release is given by the equation as follows :

We need to find the taken taken for the water to reach the ground. When it reach the ground, y will be equal to 0. So,

Above is a quadratic equation whose solutions can be calculated as follows :

Neglecting negative value.

Hence, it will take 4.93 seconds for the water to reach the ground

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find the upper bound of the range.

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step-by-step explanation: