u suuvuvn VI Uit umE i given by R = f(g(t)). EXAMPLE 7 An Application of Composition of Functions A ship is traveling at 20 mi/h parallel to a straight shoreline. The ship is 5 mi from shore. It passes a lighthouse at noon. time = noon (a) Express the distance s between the lighthouse and the ship as a function of d, the distance the ship has traveled since noon; that is, find f so that s = f(d). 5 mi (b) Express d as a function of t, the time elapsed since noon; that is, find g so that d = g(t). (c) Find fog. What does this function represent? time = t FIGURE 5

College Algebra
1st Edition
ISBN:9781938168383
Author:Jay Abramson
Publisher:Jay Abramson
Chapter3: Functions
Section3.4: Composition Of Functions
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u suuvuvn VI Uit umE i given by R = f(g(t)).
EXAMPLE 7 An Application of Composition of Functions
A ship is traveling at 20 mi/h parallel to a straight shoreline. The ship is 5 mi from
shore. It passes a lighthouse at noon.
time = noon
(a) Express the distance s between the lighthouse and the ship as a function of d, the
distance the ship has traveled since noon; that is, find f so that s = f(d).
5 mi
(b) Express d as a function of t, the time elapsed since noon; that is, find g so that
d = g(t).
(c) Find fog. What does this function represent?
time = t
FIGURE 5
Transcribed Image Text:u suuvuvn VI Uit umE i given by R = f(g(t)). EXAMPLE 7 An Application of Composition of Functions A ship is traveling at 20 mi/h parallel to a straight shoreline. The ship is 5 mi from shore. It passes a lighthouse at noon. time = noon (a) Express the distance s between the lighthouse and the ship as a function of d, the distance the ship has traveled since noon; that is, find f so that s = f(d). 5 mi (b) Express d as a function of t, the time elapsed since noon; that is, find g so that d = g(t). (c) Find fog. What does this function represent? time = t FIGURE 5
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