How do you do this problem? do you multiply 13×8=104 ?

What is the solution of sqrt x+2-15=-3

What is the value of x in the following equation. -x ^3/2 = -27

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?