PLEASE HELP !! I will give to whoever answers

In the following situation, determine whether you are asked to determine the number of permutations or combinations. then do the calculation how many ways are there to pick a starting five from a basketball team of twelve members? a. permutation; ps - 2520 b. combination; 1c, - 792 c. combination: 2cs - 2520 d. permutation; ps - 95040

Ineed to know the answer to this algebra question.

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.