how many possible ways can 8 pictures be hung along a wall?

If they are hung in a line, from left to right:

There are 8 ways to choose the first picture

   are 7 ways to choose the second picture

     are 6 ways to choose the third picture

         etc.

To find the total number of ways, multiply these together:  8 x 7 x 6 x ... x 1  =     <--- answer