April 19, 2014

Homework Help: pre calculus

Posted by alexis on Tuesday, April 2, 2013 at 10:57am.

1.)A utility company has the following rate schedule for natural gas usage in a city’s business district:
Monthly service charge: $8.80
Per therm service charge
1st 25 therms : $0.6686/therm
Over 25 therms: $0.85870/therm

(a) What is the charge for using 25 therms in one month?
(b) What is the charge for using 45 therms in one month?
(c) Construct a function that gives the monthly charge C for x therms of gas.

I am totally lost, can someone please show me how to do this???

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