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问题：If the square root of t is a real number, is the square root of t positive?(1) t＞0(2) t2＞0...

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问题：If the ratio of brown cars to blue cars in a certain parking lot is 2:3, how many brown cars are in the lot?(1) There are 15 blue cars in the lot.(2) There are 25 cars total in the lot....

问题：Over a holiday weekend, a certain car dealer sold off 4 of the cars on its lot. If the cars sold for an average of $6,000 each, how many cars were on the dealer's lot at the beginning of the weekend?(1) The average value of the remaining cars on the lot i...