A group of friends decide to attend a night on a cruise ship. Will last 4 hours. Ship travels upstream 18km and back to starting point. Current is 2km an hour. What is the ships speed and how long was the journey upstream?

Add the fractions, and simply the result to lowest terms. 2/3 + 2/7= ?

If sec theta = 5/3 and the terminal point determined by theta is in quadrant 4, then

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