4. A plane is traveling due east with a velocity of 65 m/s when it is thrown off its course by a crosswind of 16 m/s due south. Using the diagram below to help you, calculate the plane's angle of deviation from the flight plan as well as the total velocity of the plane.​

The chemical composition of soil varies with depth. an article in communications in soil science and plant analysis describes chemical analyses of soil taken from a farm in western australia. fifty specimens were each taken at depths 50 and 250 cm. at a depth of 50 cm, the average no3 concentration (in mg/l) was 88.5 with a standard deviation of 49.4. at a depth of 250 cm, the average concentration was 110.6 with a standard deviation of 51.5. find a 95% confidence interval for the difference in no3 concentrations at the two depths.