In March 2014, a gas company had the rate schedule shown to the right for natural gas
usage in single-family residences.
(a) What is the charge for using 30 therms in a month?
(b) What is the charge for using 200 therms in a month?
(c) Develop a function that models the monthly charge C for x therms of gas.
(d) Graph the function found in part (c).
Monthly service charge
Delivery charge
First 40 therms
Over 40 therms
Natural gas cost
First 40 therms
Over 40 therms
$18.35
$0.84327/therm
SO
$0.3306/therm
$0.5122/therm
