Why is it that |-9| = |9|

PLEASE HELP ASAP

A: The absolute value of a number gives its distance from zero on the number line.

B: when you multiply either number by -1, you get the other.

C: The absolute value of a number always gives the opposite of a negative number in the square of a positive number.

D: when the numbers are squared, they give the same answer.

The answer A. "The absolute value of a number gives its distance from zero on the number line."

Step-by-step explanation:

An absolute number has these in it '| |'. An absolute number always is positive, because it represents a difference.

For example, the difference of 0 and -30 is |30|.

Though 0 - 30 is -30, the DIFFERENCE is |30|.

As the answer says, "its distance from zero on the number line".

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