Example 7: A hot-air balloon ascending at the rate of 12 ft/sec is at a height 80 ft above the ground when a package is dropped. How long does it take the package to reach the ground?

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter6: Vector Spaces
Section6.7: Applications
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Hello, I need help answering the following question. This is in a lesson regarding antiderivatives and u-substitution. 

Example 7: A hot-air balloon ascending at the rate of 12 ft/sec is at a height 80 ft above the ground when a package
is dropped. How long does it take the package to reach the ground?
Transcribed Image Text:Example 7: A hot-air balloon ascending at the rate of 12 ft/sec is at a height 80 ft above the ground when a package is dropped. How long does it take the package to reach the ground?
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