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.
<span>b. A linear equation with slope 5 and y-intercept 1 c. A linear equation with slope 2 and y-intercept 3 d. A linear equation with slope 3 and y-intercept 2