Ben is 30 years old and daniel is 2 years old. how many years will it take until ben is only 3 times as old as daniel?

Solve: 3x+y=6 4x-2y=18 show all work !

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?

Bob the builder is making 480kg of cement mix. this is made by cement, sand and gravel in the ratio 1: 3: 4