Write the Word or Phrase That Best Completes Each Statement

Essay

Write the word or phrase that best completes each statement or answers the question.
-A gas company has the following rate schedule for natural gas usage in single-family residences:

$$\begin{array} { l l } \text { Monthly service charge } & \$ 8.80 \\\text { Per therm service charge}\\\text { 1st } \text { 25 therms } & \text { \(\$ 0.6686 /\) therm } \\\text { Over 25 therms } & \text { \(\$ 0.85870 /\) therm }\end{array}$$





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