In March 2014, a gas company had the rate schedule shown to the right for natural gas usage in single-family residences.
(a) What is the charge for using 30 therms in a month?
(b) What is the charge for using 200 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).
(a) The charge for using 30 therms in a month is $
(b) The charge for using 200 therms in a month is $
(c) C(x) = if 0≤x≤ if x> (Simplify your answers.)
(d) Choose the correct graph below. ​