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

center (1,3) with radius 6

step-by-step explanation:

we must complete the square to find the center and radius of the circle.

first make sure the x and y squared terms have 1 as their coefficients. we also make sure x and y terms together.

we now create space between the x and y terms with parenthesis.

we complete the square by taking the middle terms -2x and the -6y - divide each and square them.

we add the squares to both sides.

simplify.

and write the quadratics in factored form.

the center is (h,k) or (1,3). the radius is the square root of 36 which is 6.