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Mathematics 18 Online
OpenStudy (anonymous):

can somebody help pleaseeeeeeeeeeee!!!!!! ok . what expression represents 81 decreased by an unknown number?

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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