Is 3/12 a rational or irrational number

Graph the equationy= x+3[tex]y = x + 3[/tex]

Which of the following equations is equivalent to x/3-6/x=1

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?