Final answer:
The statement that a zero pair is two quantities that add to zero is true. Zero pairs are used in mathematics to simplify expressions, especially with integers.
Step-by-step explanation:
A zero pair is defined as two quantities that add to zero. The question asks whether a zero pair always adds to zero, and the correct answer is A. True. This concept is fundamental in algebra, particularly when dealing with addition and subtraction of integers, where we often use zero pairs to simplify expressions. For example, the numbers +3 and -3 form a zero pair because their sum is 0 (+3 + (-3) = 0).
Regarding the provided reference information, it seems to be about various concepts in mathematics, including hypothesis testing, the commutative property of addition, vector addition, mutually exclusive events, and the Pythagorean theorem. These examples from different areas of mathematics illustrate how zero pairs and other principles are applied in various contexts.