Need math help pls:)

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

He that is measured at 220° is a reflex angle. the opposite angle is obtuse. find the measure of obtuse .

What is the circumference of a circle with an area of 50.24 cm²?