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Math Help - please help very urgent

  1. #1
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    please help very urgent

    Science and medicine. It is estimated that the Earth is loosing 4000 species of plants and animals every year. If S represents the number of species living last year, how many species are on Earth this year?
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  2. #2
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    I hope I'm not taking this way too simply. If S is the number of species last year, then after one year it would have lost 4000 species, so the total number of species is S-4000.
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