How do i solve this? show work if you can (exponential equations)

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

What set does not contain -3 the set of all real numbers the set of all integers the set of all whole numbers the set of all rational numbers

What is the value of x in the this question ?