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45.5 #11: A Falling Rock A rock is thrown downward, and the distance D, in feet, that it falls int seconds is given by D=16t² + 3t. Find how long it takes for the rock to fall 400 feet by using A. the quadratic formula. Since the time cannot be negative, discard the value t=-5.09. Therefore, it takes approximately 4.91 seconds the rock to fall 400 feet. B. the crossing-graphs method.

45.5 #11: A Falling Rock A rock is thrown downward, and the distance D, in feet, that it falls int seconds is given by D=16t² + 3t. Find how long it takes for the rock to fall 400 feet by using A. the quadratic formula. Since the time cannot be negative, discard the value t=-5.09. Therefore, it takes approximately 4.91 seconds the rock to fall 400 feet. B. the crossing-graphs method.

Algebra and Trigonometry (6th Edition)
Algebra and Trigonometry (6th Edition)
6th Edition
ISBN:9780134463216
Author:Robert F. Blitzer
Publisher:Robert F. Blitzer
ChapterP: Prerequisites: Fundamental Concepts Of Algebra
Section: Chapter Questions
Problem 1MCCP: In Exercises 1-25, simplify the given expression or perform the indicated operation (and simplify,...
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15.5 #11: A Falling Rock A rock is thrown downward, and the distance D, in feet, that it falls in t seconds is given by D=16t² + 3t. Find how long it takes for the rock to fall 400 feet by using A. the quadratic formula. Since the time cannot be negative, discard the value t=-5.09. Therefore, it takes approximately 4.91 seconds the rock to fall 400 feet. B. the crossing-graphs method. Rounding to two decimal places we can see intersection point is at x=4.91. Therefore, it takes approximately 4.91 seconds the rock to fall 400 feet.
Transcribed Image Text:15.5 #11: A Falling Rock A rock is thrown downward, and the distance D, in feet, that it falls in t seconds is given by D=16t² + 3t. Find how long it takes for the rock to fall 400 feet by using A. the quadratic formula. Since the time cannot be negative, discard the value t=-5.09. Therefore, it takes approximately 4.91 seconds the rock to fall 400 feet. B. the crossing-graphs method. Rounding to two decimal places we can see intersection point is at x=4.91. Therefore, it takes approximately 4.91 seconds the rock to fall 400 feet.
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