Bruce is eight years older than his brother Robin. In three years Bruce will be twice as old as Robin. How old are Bruce and Robin?

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?

Prove that 16^4-2^13-4^5 is divisible by 11.

Find the interior angle of a regular polygon which has 6 sides