How many different committees can be formed from 7 teachers and 46 students if the committee consists of 3 teachers and 2 students? in how many ways can the committee of 5 members be selected?

Let w=23 . what is the value of w + 45 ?

An advertising firm has an old computer that can prepare a whole mailing in 6 hours. with the of newer model the job is complete in 2 hours. how long would it take the newer model to do the job alone?

Complex numbers multiply √-4 * √-25 and show all intermediate steps. alternative notation is sqrt(-4) * sqrt(-25).