question archive 44) Cost of Natural Gas In April 2009, Nicor Gas had the following rate schedule for natural gas usage in single- family residences: Monthly customer charge $8
44) Cost of Natural Gas In April 2009, Nicor Gas had the following rate schedule for natural gas usage in single- family residences: Monthly customer charge $8
Subject:MathPrice: Bought3
44) Cost of Natural Gas In April 2009, Nicor Gas had the following rate schedule for natural gas usage in single- family residences:
Monthly customer charge $8.40 Distribution charge
1st 20 therms $0.1473/therm
Next 30 therms $0.0579/therm
Over 50 therms $0.0519/therm
Gas supply charge $0.43/therm
(a) What is the charge for using 40 therms in a month?
(b) What is the charge for using 150 therms in a month?
(c) Develop a model that gives the monthly charge C for x
therms of gas.
(d) Graph the function found in part (c).
Source: Nicor Gas, Aurora, Illinois, 2009
