"list, from beginning to end, the stages in the weather as a cold front goes by: (a) warm air is forced upward where it cools; (b) air cools and sinks, pressure rises, rain stops; (c) cumulonimbus or nimbostratus clouds form; (d) thunderstorms with heavy showers and gusty winds occur"

An electric power distributor charges residential customers $0.10 per kilowatt-hour (kwh). the company advertises that "green power" is available in 150 kwh blocks for an additional $4 per month. (green power is generated from solar, wind power, and methane sources.) if a certain customer uses an average of 391 kwh per month and commits to one monthly 150 kwh block of green power, what is her annual power bill