If someone throws a ball down from a height of 100 meters the balls distance from the ground can be modeled by the equation  d=-9.8t-15t+100 where t is the time in seconds and d is the distance in meters at what time(t) will the ball hit the ground?

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter9: Quadratic Functions And Equations
Section9.6: Solving Quadratic Equations By Using The Quadratic Formula
Problem 15CYU
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If someone throws a ball down from a height of 100 meters the balls distance from the ground can be modeled by the equation 

d=-9.8t-15t+100 where t is the time in seconds and d is the distance in meters

at what time(t) will the ball hit the ground?

 

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