I have a $ 40 balance on my cellphone. Each call costs 15 cents. Write a function f(x) which is the balance left after x calls. What kind of function is this?

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter9: Quadratic Functions And Equations
Section9.9: Combining Functions
Problem 52HP
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I have a $ 40 balance on my cellphone. Each call costs 15 cents. Write a function f(x) which is the balance left after x calls. What kind of function is this?

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