1. Write a cost function for each situation. Identify all variables used. (a) A chain-saw rental firm charges $12 plus $1 per hour.
(b) A trailer-hauling service charges $445 plus $2 per mile.
(c) A parking garage charges 50¢ plus 35¢ per half-hour.
(d) For a one-day rental, a car rental charges $44 plus 28¢ per mile.

2

step-by-step explanation:

none of the above.

for one of the equations to be used in the process, there has to be a term in the equation since squared is .

since there is only a term in the first equation, we cannot derive a from completing the square.

solving with completing the square

step-by-step explanation:

we have

using a graphing tool

see the attached figure

this is a quadratic equation (vertical parabola) open up

the vertex is a > vertex

the domain of the function is all real > interval (-∞,∞)

the range of the function is the > [-6.125,∞)

the function has two x->   and

the function is increasing over the > (0.25,∞)

the function is decreasing over the > (-∞,0.25)