The answer is 9
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The opposite number of 9 is -9. In mathematics, the opposite of a number is the same distance from zero on the number line, but in the opposite direction. This is denoted by adding a negative sign in front of the number, indicating its direction opposite to the original number.
The answer depends on which operation is used to define an opposite. For example, the opposite of 9 under addition is different to its opposite under multiplication.
9
The number (-9) is the additive inverse of 9.Inverse operations can also be used to find the additive inverse of a specific number. For example, -9 is the additive inverse of 9 since the sum of -9 and 9 is 0. Additive inverses come in pairs; 9 is the additive inverse of -9, just as -9 is the additive inverse of 9. Any two numbers are additive inverses if they add up to 0.Visualize a pair of additive inverses on the number line. The number 9 and its additive inverse -9 are both nine units away from 0 but on opposite sides of 0. For this reason, -9 is called the opposite of 9, and 9 is the opposite of -9. The opposite of a number may be positive or negative.
9
A negative number. (ex. -9)
It depends on what you mean by an opposite. Every real number has an additive opposite but 0 does not have a multiplicative opposite.