A power plant has 4 tons of coal. A ton produces 2,460 kilowatt hours of electricity. The Plant reserves enough electricity to power nine light bulbs for a year. How many additional kilowatt hours of electricity are produced? (876 kilowatt of electricity to power a 100-watt light bulb a year)

Mary beth used the mapping rule to find the coordinates of a point that had been rotated 90° counterclockwise around the origin. examine the steps to determine whether she made an error. m (3, –6) is rotated 90° counterclockwise. (x, y) → (–y, x) 1. switch the x- and y-coordinates: (6, –3) 2. multiply the new x-coordinate by –1: (6(–1), –3) 3. simplify: (–6, –3) .