There are 12 seniors, 10 juniors, 5 sophomores and 3 freshmen on student council. A committee of 7 members is formed. Determine the number of
ways to form this committee given the following conditions:
the committee must have 3 seniors, 2 juniors, 1 sophomore and 1
freshman.

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

James wants to promote his band on the internet. site a offers website hosting for $4.95 per month with a $49.95 startup fee. site b offers website hosting for $9.95 per month with no startup fee. for how many months would james need to keep the website for site a to be a better choice than site b?

Using only the digits 5, 6, 7, 8, how many different three digit numbers can be formed if no digit is repeated in a number?