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I don't understand how to round to significant digits

565 lb * 30 ft

4900 ft/ 144 sec

786 hr * 23 miles per hour

  • math/chemistry -

    The first one will be to one significant digit because of the 30 has only one sig digit.

    The second will have two because of the numerator.

    The third will have 2 because of the denominator.

  • math/chemistry -

    I under stand this but once i get the answers i really don't know how to do it these re the answers i get
    1. 16950
    2. 34.02777778
    3. 18078

    but i don't understand how to round it like would the first one be 10?

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