I NEED HELPPP WITH THISSS

Yvaries inversely as x. y =12 when x=5. find y when x=4

(-y to the power of 2 - 4y- to the power of 2 -6 y +3)

An airplane is flying at an elevation of 5150 ft, directly above a straight highway. two motorists are driving cars on the highway on opposite sides of the plane, and the angle of depression to one car is 35 ̊ and to the other is 52 ̊. how far apart are the cars?