Final answer:
The set P is written in roster form as { -3, -2, -1, 0 }, which includes the elements of the set in ascending order.
Step-by-step explanation:
The set P in roster form, which lists the elements of the set, is { -3, -2, -1, 0 }. When writing a set in roster form, we list all elements of the set within curly braces, separated by commas. The set P contains four integers that include negative numbers and zero, listed in ascending order.