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

, and

for

step-by-step explanation:

we can analyze the pattern at which the terms increase. let us denote , , , so that we can call

note the following:

the pattern: to get the next term value, we just add the next term number (e.g. 1st, 2nd, to the previous term value (term values are the given numbers in the question, 1, 3, 6, 10, 15,

from , to get to , we add

from , to get to , we add

etc.

we need to form a recursive formula, a formula that has the next term as a function of the previous term. so a possible recursive formula can be

, and for

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step-by-step explanation: