An electrician uses the function f(x) = 60 + 40x to calculate the total cost, in dollars, for a service call that takes x hours to complete. what does the coefficient 40 represent?
a) the electrician works 40 hours.
b) the electrician charges $40 per hour.
c) the electrician drives 40 miles to work.
d) the electrician charges a $40 trip charge.

B) The electrician charges $40 per hour.

Step-by-step explanation:

From the question, we were being told that An electrician uses the function

f(x) = 60 + 40x  

to calculate the total cost (in dollars) for a service call which takes x hours to complete.

It means that the electrician charges a service call fee of $60 plus  $40 per hour, the x represents the number of each hour he charges the extra $40

hiking down a winding trail.

step-by-step explanation:

whole numbers.

step-by-step explanation:

we are given the average monthly rainfall (in millimeters) model r(m) for the years 1900-2009 as a function of the month number m.

as we can see m is taken for the number of months for years 1900-2009.

we know that number of months can't be a negative number or decimal number or a fraction.

so, the number of months could be only positive whole numbers.

therefore, whole numbers is more appropriate for the domain of r.