Answer:
The easiest way to test if water is acidic is to use litmus paper. Litmus paper is a paper that contains special dyes that will change color when exposed to acids or bases. In your case, if you dip blue litmus paper into water samples and it turns pink or red, then the water is acidic.
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Note that with |x|, the value x will always be positive when simplified. This means that:
B) |-3.5|, |4.2|, |-9| is your answer, because it becomes, 3.5, 4.2, 9
hope this helps
