On a quiz show the contestant aho gets the correct in the shortest amount of time wins. The host ask for the solution to 49+83+51. Contestant number 1 quickly found the sum of 49+51 to be 100 then added 83 to get 183 which property did the contestant use.

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?