Algebra 1

Published by Prentice Hall
ISBN 10: 0133500403
ISBN 13: 978-0-13350-040-0

Chapter 4 - An Introduction to Functions - 4-4 Graphing a Function Rule - Practice and Problem-Solving Exercises - Page 258: 39


The acorn takes between 2 to 3 seconds to fall to the ground. The graph for the function h(t)=100-16$t^{2}$ is shown below.

Work Step by Step

1. Graphically Looking at the graph, when h=0, t=2.5 which shows that t=2.5 is the x-interectp on the graph. This also means that is takes 2.5 seconds for acorn to hit the ground as the height goes from 100ft at t=0secs to height 0ft at t=2.5 2. Mathematically, The acorn when hits the ground has a height of 0 ft so we can make h(t)=0 and find the time. 0=100-16$t^{2}$ 100=16$t^{2}$ $t^{2}$ = $\frac{100}{16}$ t=$\sqrt \frac{100}{16}$ t=2.5 Therefore, 2.5 is between 2 and 3 which are whole numbers.
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