Aplane flying horizontally at an altitude of 4 mi and a speed of 465 mi/h passes directly over a radar station. find the rate at which the distance from the plane to the station is increasing when it is 10 mi away from the station.

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?