At the beginning of May, the electric meter on a house showed 648.19 kilowatt hours. At the end of May, the electric meter on the same house showed 1,128.21 kilowatt hours. How many kilowatt hours of electricity were used during May?

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Rosy waxes 2/3 of her car with 1/4 bottle of car wax. at this rate, what fraction of the bottle of car wax will rosey use to wax her entire car

Pyotr tchaikovsky sporting goods operates on a 45% overhead based on the selling price, which results in an overhead of $65.34 on the newest version of an air hockey game set. if the air hockey game set costs pyotr tchaikovsky sports $49.32, find the selling price, the markup, and the net profit.