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Q13: Between what two years is the difference
Q17: Based on Mrs.Smith's electric bill for last
Q54: A vendor has learned that, by pricing
Q71: <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB8475/.jpg" alt=" A)
Q91: <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB8475/.jpg" alt=" A)
Q97: <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB8475/.jpg" alt=" A) (0, 0)
Q101: <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB8475/.jpg" alt=" A)
Q104: <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB8475/.jpg" alt=" A) 4, 1
Q106: <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB8475/.jpg" alt=" A) no solution
Q227: <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB8475/.jpg" alt=" A) -8xy B)