Explanation Given: The height (in feet) of the stone at any time t (in seconds) measured from the ground, is given by, − 16 t 2 + 64 t + 80 (1) Formula used: Formula to find out the roots of a quadratic equation of the form, a x 2 + b x + c is given by the formula, x 1 , x 2 = − b ± b 2 − 4 a c 2 a (2) Where, x 1 and x 2 are roots of the quadratic equation. a , b and c are constants numbers. To find the range of time t = − 16 t 2 + 64 t + 80 when the stone is at or greater than a height of 128 ft from the ground − 16 t 2 + 64 t + 80 ≥ 128 16 t 2 − 64 t − 80 ≤ − 128

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ISBN: 9781337825597

Author: Tan

Publisher: INTER CENG

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Chapter 1, Problem 60RE

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To calculate: The interval of time when the stone is at or greater than a height of 128 ft from the ground.

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Chapter 1, Problem 59RE

Chapter 1, Problem 61RE

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The interval of time when the stone is at or greater than a height of 128 ft from the ground.

Solution Summary: The author calculates the interval of time when the stone is at or greater than a height of tin left[1,3right].

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To calculate: The interval of time when the stone is at or greater than a height of 128 ft from the ground.

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Chapter 1 Solutions