There are 7 students in a small class. to make a team, the names of 2 of them will be drawn from a hat. how many different teams of 2 students are possible?

What is the sum of these mixed numbers 2 1/8 + 4 3/8

Ammonia molecules have three hydrogen atoms and one nitrogen atom.how many of each atom arein five molecules of ammonia

Thompson and thompson is a steel bolts manufacturing company. their current steel bolts have a mean diameter of 127 millimeters, and a variance of 36. if a random sample of 35 steel bolts is selected, what is the probability that the sample mean would differ from the population mean by greater than 0.5 millimeters? round your answer to four decimal places.