What 3 numbers that are greater than 12,000 but less than 13,000?

Varies inversely with x. if y=8.5 when x=-1 find x when y=-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?

What is the equation of a line that passes through points (0, 4) and (-4,-8)?