Geoff needs to create a password for his email account. The password most have three letters. How many different passwords can he make? Assume he may not have use each letter more than once.

A. 51 B. 676 C. 15,600 D. 358,800

Tom can paint the fence in 12 hours, but if he works together with a friend they can finish the job in 8 hours. how long would it take for his friend to paint this fence alone?

Over the course of the school year, you keep track of how much snow falls on a given day and whether it was a snow day. your data indicates that of twenty-one days with less than three inches of snow, five were snow days, while of the eight days with more than three inches of snow, six were snow days. if all you know about a day is that it is snowing, what is the probability that it will be a snow day?

Use sigma notation to represent the following series for 9 terms.