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???

- pre calculus -
**Steve**, Tuesday, April 2, 2013 at 11:17am
is using x therms,

f(x) = 8.80 + .6686x for 0<=x<=25

25 therms cost $16.715, so

f(x) = 8.80+16.715 + .85870x

= 25.515 + .85870x for 25<x

now just plug in values for x, using the appropriate function

- pre calculus -
**alexis**, Wednesday, April 3, 2013 at 9:05am
what do you mean when you say, "the appropriate function?" what function are you referring to?

- pre calculus -
**Breanna**, Thursday, March 6, 2014 at 8:28pm
I mean to where I have to graph the following function using transformations. And have to be sure to graph all of the stages on 1 graph. Then I have to state the domain and range.

- pre calculus -
**vadivel**, Friday, October 24, 2014 at 12:47pm
f(x) = 8.80+0.6686x for 0 < x <= 25

f(x) = 25.515+0.85870(25-x) for x > 25

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