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What signals you that factoring by grouping is the best method to use when factoring a problem?
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Two customers went to a post office. first customer paid $12 for 14 and 5 envelopes the second paid 24.80 for 10 postcards and 15 envelopes. what is cost of each envelope?
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Dots sells a total of 279 t-shirts ($2) and shorts ($4). in april total sales were $670. how many t-shirts and shorts did dots sell?
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What is (-8.1) + (-8.9) and explain how...
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