Aball is thrown directly up in the air from a height of 5 feet with an initial velocity of 60 ft/s. ignoring air resistance, how long until the ball hits the ground? use the formula 2003-19-06-00-00_files/i008.jpg, where h is the height of the ball in feet and t is the time in seconds since it is thrown. round your answer to the nearest tenth. a. 2.1 seconds b. 3.8 seconds c. 2.4 seconds d. 1.8 seconds

Lab reagent, hypothesis test.a reference solution used as a lab reagent is purported to have a concentration of 5 mg/dl. six samples are taken from this solution and the following concentrations are recorded: (5.32, 4.88, 5.10, 4.73, 5.15, 4.75) mg/dl.these six measurements are assumed to be an srs of all possible measurements from solution.they are also assumed to have a standard deviation of 0.2, a normal distributin, and a mean concentration equal to the true concentration of the solution.carry out a significance test to determine whether these six measurements provide reliable evidence that the true concentration of the solution is actually not 5 mg/dl.