If cos = -2/3 which of the following are possible for the same value of

Which of the following statement about pascal's triangle are true?

Is the number 128.439 a rational number

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?