Answer:
1. The two numbers are the additive inverse of each other.
2. The two numbers are real numbers but the signs before them show that they are the opposite of each other.
Step-by-step explanation:
The Additive inverse of a number is that number which is added to it to give the result, 0. The number bears the opposite sign. To obtain the additive inverse of a number, simply multiply it by -1. For example, the additive inverse of 10 is;
10 * -1 = -10
The numbers 10 and -10 are real numbers, because real numbers tend to bear the opposite sign.
Addition of 10 and -10 will yield zero. This is characteristic of additive inverse.
