Plz help me timed plz

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

Write the expression in complete factored form. 5n_(c - 3) - n(c - 3) =

Could somebody me with this radical simplification?