Monthly service charge .

Per therm service charge

First therms         /therm

Over therms         /therm

Gas 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 :

.