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The smallest division on this ruler is 0.1 cm. Therefore when making this measurement you
must estimate to 1 place of uncertainty which is 0.01cm. The length of the pencil would be
recorded as 9.50cm.
The author read this as 9.50 cm. I think it looks a little over - like 9.51 cm. The last
digit is an estimate, so we don't need to agree. If you think it is right on the dash,
you need to use a zero for your estimated digit as the author did.

The picture represents the process that produces most of the energy used by living organisms on earth. which process is represented in the picture? a) the magnetic attraction between two hydrogen nuclei. b) the fusion of hydrogen nuclei to produce a helium nucleus in the core of the sun. c) the fission of hydrogen nuclei to produce a helium nucleus in the core of the sun. d) the chemical reaction between hydrogen nuclei to produce a helium nucleus in earth's atmosphere.