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Find two rational expressions that have the difference of 2-n/n-4

If p(a) = 0.70 and p(b) = 0.20, then a and b are independent events if

The ivring berlin learning center would like a possible net profit of $650,000 on its new resource manual it sells to schools. the fixed costs for producing the manual are $780,000 and the variable cost per package is $19.85. if the estimated unit sales are 1,250,000 units, what selling price unit should the ivring berlin learning center try?