In a class of 30 students, 17 have a brother and 14 have a sister. There are 8 students who have a brother and a sister. What is the probability that a student chosen
randomly from the class does not have a brother?

What is the radius of a circle with an area of 78.5 cubic inches? use 3.14 for pie

The weekly amount spent by a company for travel has an approximately normal distribution with mean = $550 and standard deviation = $40. a) what is the probability that the actual weekly expense will exceed $570 for more than 20 weeks during the next year? (note: one year = 52 weeks) b) what is the probability that actual weekly expenses exceed $580 for 10 or more, but 16 or fewer weeks during the next year?

Lauren has five shells she found on the beach seashells represent one-third of the shells her whole collection how many shells does lauren have in her whole collection