In March 2014, a gas company had the rate schedule shown to the right for natural gas usage in single-family residences. Need A through D, please.

$19.25 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). Monthly service charge Delivery charge First 40 therms Over 40 therms Natural gas cost First 40 therms Over 40 therms $0.75152/therm $0 $0.3718/therm $0.5746/therm (a) The charge for using 30 therms in a month is $7. (Simplify your answer. Round to the nearest cent.)