How many different ways can 9 people be ordered in a line? Please help me find this factorial.

Factorials are not too difficult, and are actually sort of fun.  The way that you get the answer is by multiplying the number one by two, then that amount by three, then that amount by four all the way up to the number you need the factorial for. Your question would look like this:

1 X 2 X 3 X 4 X 5 X 5 X 6 X 7 X 8 X 9 = 362880

Some calculators have a factorial button on them, but if you just have a scientific calculator, just punch in the numbers.