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The function is $\"\"$ , where $\"\"$ is the height(in meters) after $\"\"$ seconds.

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(a)

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The function is $\"\"$ .

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Substitute $\"\"$ in the function.

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$\"\"$

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The height of the rock when $\"\"$ second is $\"\"$ meters.

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Substitute $\"\"$ in the function.

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$\"\"$

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The height of the rock when $\"\"$ seconds is $\"\"$ meters.

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Substitute $\"\"$ in the function.

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$\"\"$

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The height of the rock when $\"\"$ seconds is $\"\"$ meters.

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(b)

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The height of the rock is $\"\"$ meters.

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$\"\"$

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The height of the rock when $\"\"$ seconds is $\"\"$ meters.

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The height of the rock is $\"\"$ meters.

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$\"\"$

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The height of the rock when $\"\"$ seconds is $\"\"$ meters.

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The height of the rock is $\"\"$ meters.

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$\"\"$

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The height of the rock when $\"\"$ seconds is $\"\"$ meters.

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(c)

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If the height is zero, then the rock strike the ground.

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$\"\"$

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When $\"\"$ seconds, the rock strike the ground.

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(a)

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$\"\"$ meters.

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$\"\"$ meters.

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$\"\"$ meters.

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(b)

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$\"\"$ seconds.

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$\"\"$ seconds.

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$\"\"$ seconds.

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(c)

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$\"\"$ seconds.