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15. Let's apply our knowledge of functions and their inverses to a real world problem: To make a
long-distance call, your phone company charges $1.50 to make the connection, and an additional $0.10
minute that you are on the line once connected.
every
for
a. Write an equation for the price of a long-distance call, p, in terms of the length of the call in minutes,
1.50 +0.10 = 1
m:
b. When you get the phone bill, you see that your sister made a long-distance call that cost $2.75. How
long was she on the phone?
c. Think about how you solved part (b). Write an equation to determine m in terms of p. (That is, how
you calculate the length of a call based on its price?)
do
fom?
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Bonus: Let f(x) = 2x - 3 and g(f(x)) = 5 - 4x. Find g(4).
