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OpenStudy (anonymous):
can somebody help pleaseeeeeeeeeeee!!!!!! ok . what expression represents 81 decreased by an unknown number?
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jimthompson5910 (jim_thompson5910):
let x = "unknown number"
jimthompson5910 (jim_thompson5910):
"81 decreased by an unknown number" means 81 - x because "decreased" means we subtract
jimthompson5910 (jim_thompson5910):
another example 10 decreased by 7 = 10 - 7 = 3
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