There are eight girls competing in an ice-skating competition. in how many ways can they finish in first, second, and third place

Since we need to find the number of ways they could enter first, second and third place, (I can't demonstrate, but you should get the idea) take 8, 7 and 6 and multiply them, 5-1 we don't need, we just need 8, 7, and 6, multiply those three numbers and you get 336, there you go, 336 ways to organize all 8 girls in first, second and third place, hope this helps

(x) - (y) = (1 + 4i)

(3 + 6i) - (2 + 2i) = (1 + 4i)