two friends are talking to another person across the building the other person can hear them but not see them why is this?

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two friends are talking to another person across the building the other person can hear them but not see them why is this?

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King 2 months 2021-07-21T22:29:21+00:00 1 Answers 2 views 0

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    2021-07-21T22:31:20+00:00

    Answer:

    Hey

    Say that there was no light on in the building that they were ch,at,tin,g in, then they could hear each other but not see each other.

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )