Final answer:
The relationship between the number of nails (N) and the number of shelves (S) is that the number of nails is four times the number of shelves. This can be represented by the equation N = S * 4.
Step-by-step explanation:
In this table, the number of nails (N) is four times the number of shelves (S). To complete the table, we can multiply the number of shelves by 4 to find the number of nails. For example, when S = 1, N = 1 * 4 = 4. This relationship can be represented by the equation N = S * 4.