Need the answer ASAP I am giving 20 points

Always because x and y are each 90 degrees and if added together they would equal to 180 degrees.

Step-by-step explanation:

Sequences are usually defined as a function with a domain in the set of positive integers. the terms of the sequence are usually denoted as  ,  ,    . it is defined the way it is so that the "first" term would correspond to n = 1, the "second" term would correspond to n = 2, and so on.  these would be based on the apparent terms, terms enumerated based on what we see.that is the gist of why the answer is "all integers where n  ≥ 1"we do not include "0" because there is not a zeroth term when we are relying on apparent terms