8. An astronaut, Is doing an experiment in a new planet He throws a rock from the top of a 20-foot-high hill at a speed of 12 feet per second. The rock's height above ground can be modeled by the equation h(t) =-4t2+8t + 20 a. How long does the rock take to reach the maximum height? b. What is the maximum height of the rock? How long does the rock take to reach the height of 8 feet? C.

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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8.
An astronaut, is doing an experiment in a new planet He throws a rock from the top of a 20-foot-high hill at
a speed of 12 feet per second. The rock's height above ground can be modeled by the equation
h(t) =-4t2+8t +20
a.
How long does the rock take to reach the maximum helght?
b.
What is the maximum height of the rock?
How long does the rock take to reach the height of 8 feet?
C.
Transcribed Image Text:8. An astronaut, is doing an experiment in a new planet He throws a rock from the top of a 20-foot-high hill at a speed of 12 feet per second. The rock's height above ground can be modeled by the equation h(t) =-4t2+8t +20 a. How long does the rock take to reach the maximum helght? b. What is the maximum height of the rock? How long does the rock take to reach the height of 8 feet? C.
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