Question

|-9| = |9| true or false.

Answer 1

Step-by-step explanation:

1) -9 = 9 true/false

the answer is false because negative and positive quite unlike in terms.

2) -(-21) = -21

Using the symbols multiplication rule,

Where,

+ × + = +

- × - = +

- × + = -

+ × - = -

Therefore, -(-21) = +21 = 21

⟼ 21 = -21 $\sf true / \: \sout{false}$

Answer 2

     $\text{\#1, True \;\;\;\;\;\;\;\;\;\;\; }$            |-9| = |9|

The absolute value (the distance from 0) of -9 and 9:

$9 = 9$

     This is true.

$--------------------$

     $\text{\#2, False \;\;\;\;\;\;\;\;\;\;\;}$           -(-21) = -21

Given:

-(-21) = -21

Negative times a negative is a positive:

21 ≠ -21

     This is not true.

$--------------------$

To help you answer the last one about P on the number line, we will need more context.