The phenomenon you are looking for is sometimes loosely called the Multiplication Principle. Suppose you have $n$ different operations, and for clarity and ease let's call these operations $A_1, A_2, \dots , A_n$. For example, these operations could be picking out an outfit, picking a card from a deck, selecting letters or numbers for a license plate, etc. Furthermore, let's say there are $k_1$ ways to accomplish the operation $A_1$, $k_2$ ways to accomplish operation $A_2$, and so on. Then, the number of ways to accomplish all the operations $A_1, A_2, \dots , A_n$ is:
$ k_1 \times k_2 \times \dots \times k_n. $
For example, if you have $4$ shirts, $10$ pairs of pants, and $7$ pairs of shoes, the number of outfits you can make is
$ 4 \times 10 \times 7 = 280. $
If you have a hockey team with $24$ players, the number of ways to select a captain and assistant captain are
$ 24 \times 23 $
since there are $24$ players to be selected for the captaincy and $23$ players (everyone but the one already selected to be captain) for the assistant captaincy.
In light of this "multiplication principle" and Ross's comments, you should be able to write down the answers for each question. Only after you have tried these problems (and shared your attempts), ask for help if necessary.