Problem

Cost of Natural Gas In March 2014, Laclede Gas had the rate schedule (top, right) for natu...

Cost of Natural Gas In March 2014, Laclede Gas had the rate schedule (top, right) for natural gas usage in single-family residences.

(a) What is the charge for using 20 therms in a month?


(b) What is the charge for using 150 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 $19.50

Delivery charge

First 30 therms $0.91686/therm

Over 30 therms $0

Natural gas cost

First 30 therms $0.3313/therm

Over 30 therms $0.5757/therm

Monthly service charge

Delivery charge

First 30 therms

Over 30 therms

Natural gas cost

First 30 therms

Over 30 therms

$19.50

$0.91686/therm

$0

$0.3313/therm

$0.5757/therm

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