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Pre-Calculus Help Very Much Needed? In how many different ways can you score 21 points using: 7, 6, 3, 2? Are cells that excrete waste products only found in the excretory system? Recent survey of 150 households, 54 had central air Find p and q, where p is the
proportion of households with central air conditioning.? What does 15mA mean in electrical curent?