Answer:
k = 2.
Step-by-step explanation:
j = c/k where c is a constant.
When k = 3, j = 12 so
12 = c/3
c = 36.
So the relation is j = 36/k
When j = 18
18 = 36 / k
So 18k = 36
k = 2.
The intersection of the steps is just a fancy way of asking wi\hich numbers are in both equations so lets look and see :)
The 1st = 0...1...5...7...8
The 2nd =0........5...7........9
Answer = D {0, 5, 7}
Hope this helps have any questions let me know :)