A heater is set to turn on and start heating if the temperature drops below 20º Celsius. Write an inequality to model the situation. Give a sample value (solution) which would cause the heater to turn on.

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?