That really depends on many factors such as, what you are posting i.e. a letter or package, from where you are posting it and the size and weight of the item.
how many stamps does it take from vancouver to california
That many
It takes 42 postage stamps
From where???? The Moon?
5
It takes 1
1.
The amount of stamps depends on your location. It will take more stamps to send a letter to England from the United States than from Italy.
1
12
100000000000000000000000
7