Well, it is complicated because I've never studied that in math. I searched up the definitions of both in math and they're very similar. Permutation is a one of many possible variations and can change. A combination is the process of joining to things to be one. So if I had to choose I think I'd go with permutation since it isn't asking you to list all the ways you can make groups out of the number 30.
For this use the law of sines: cross-multiply: 16×sin (J) = 11×0.97 sin(J) = 10.72/16 sin(J) = 0.67 hit the "arcsin" button on your calculator: therefore answer B. 42 is the correct answer!!