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The height y, in feet, of a baseball t seconds after being thrown upward can be approximated by y = −16t2 + 64t + 4. How many seconds after the ball is released is it 20 feet above the ground? Round to the nearest tenth of a second. (See Example 4 in this section.) The ball will first be 20 feet above the ground after ? seconds (on its way up), and again after ? seconds (on its way down).

The height y, in feet, of a baseball t seconds after being thrown upward can be approximated by y = −16t2 + 64t + 4. How many seconds after the ball is released is it 20 feet above the ground? Round to the nearest tenth of a second. (See Example 4 in this section.) The ball will first be 20 feet above the ground after ? seconds (on its way up), and again after ? seconds (on its way down).

Algebra & Trigonometry with Analytic Geometry
Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter2: Equations And Inequalities
Section2.2: Applied Problems
Problem 39E
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The height y, in feet, of a baseball t seconds after being thrown upward can be approximated by y = −16t2 + 64t + 4. How many seconds after the ball is released is it 20 feet above the ground? Round to the nearest tenth of a second. (See Example 4 in this section.) The ball will first be 20 feet above the ground after ? seconds (on its way up), and again after ? seconds (on its way down).
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