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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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How do you use the elimination method for this question? explain, because i really want to understand!
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Which spreadsheet would be used to compute the first nine terms of the geometric sequence a^n=32•(1/2)n-1
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