How do I solve this questions

What is the inverse of the function f(x) = 2x + 1?

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?

If u answer this u will get good luck for a year