Please help please help

Can someone explain the elimination method to me for this problem?

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

Iwill give ! if m∠a=59 and m∠3=81°, what is m∠b? m∠b= _[blank]_°