A plane in still air can fly at an average speed of 150 km/h. On a particular journey of 720 km, it flies against a particular wind speed of average speed of
km/h and then returns with the wind speed.
If the entire trip takes a total of 10 hours, find the average speed of the wind.

Which of the following represents a number squared is equal to twenty more than nine times that number ? a) x squared = 9x + 20 b) x squared = 20x + 9 c) x squared > 9 + 20x d) x squared = 9 + x + 20

The solution set for 5v2 – 125 = 0 is

Determine whether the points (–3,–6) and (2,–8) are in the solution set of the system of inequalities below. x ? –3 y < 5? 3x + 2 a. the point (–3,–6) is not in the solution set, and the point (2,–8) is in the solution set. b. neither of the points is in the solution set. c. the point (–3,–6) is in the solution set, and the point (2,–8) is not in the solution set. d. both points are in the solution set.