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Mr. Martinez hires a plumber to fix his kitchen
sink. The plumber charges a one-time fee of $45
and an additional $15 for parts. He also charges
$40 for each hour he works.
A. The cost of hiring the plumber can be
represented by a linear function. Identify the rate
of change and initial value of this function.
Explain what these values represent in terms of
the situation.

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Answer:

Step-by-step explanation:

The $45 fee is a one-time thing and is the initial value of this function.  The rate of change of the function is $40/hr.  

It's not clear when the $15 for parts is paid.  One interpretation would be that this is a second up-front charge, in which case the initial value would be

$45 + $15, or $60.

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