4 The height, h, of an ball that is thrown st upward from an initial position 3 feet off ground with initial velocity of 90 feet per given by the equation h = 3+90t - 161 time in seconds. After how many seconc ball be 84 feet above the ground? %3D

Elementary Geometry For College Students, 7e
7th Edition
ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.
ChapterP: Preliminary Concepts
SectionP.CT: Test
Problem 1CT
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It is given that, the height h of a ball that is thrown straight upward from an initial position 3 feet off the ground with an initial velocity of 90 feet per second is  given by the equation h=3+90t-16t2 ......................... (1) 

 

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