Attachment mathswatch

Which expression shows the sum of the polynomials with like terms grouped together

How can you find the mean absolute deviation (mad) for this set of data?

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?