A ball is thrown from a height of 130 feet with an initial downward velocity of 6 ft/s. the balls height h (in feet) after t seconds is given by the following. h=130-6t-16t^2 how long after the ball is thrown does it hit the ground?
round to nearest hundredth.

An optical inspection system is used to distinguish among different part types. the probability of a correct classification of any part is 0.92. suppose that three parts are inspected and that the classifications are independent. let the random variable x denote the number of parts that are correctly classified. determine the probability mass function of x. round your answers to four decimal places (e.g. 98.7654). x f(x) 0 1 2 3