Monthly customer charge .

Distribution charge

First therms             /therm

Next therms            /therm

Over therms            /therm

Gas supply charge        /therm

(a)

Find the charge for using therms in a month.

Charge

The charge for using therms in a month is .

(b)

Find the charge for using therms in a month.

Charge

The charge for using therms in a month is .

(c)

Find the model that relates the monthly charge for therms of gas.

.

(d)

Graph the function .

Draw the table of different values of for .

	\ \	\ \
	\ \	\ \
	\ \	\ \

	\ \	\ \
	\ \	\ \
	\ \	\ \

\ \

	\ \	\ \
	\ \	\ \
	\ \	\ \

Graph :

1). Draw a coordinate plane.

2). Plot the points found in the table and connect the plotted points.

(a) .

(b).

(c) .

(d) Graph of the function :

.