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To what decimal place should each answer be rounded? and how many significant figures does the rounded answer have?

a) 9cm + 2.8 cm= 11.8cm (unrounded)

b) 0.135 atm + 0.6 atm= 0.735 atm (unrounded)

can you show me how to do this?

1 answer

Read significant figures and rounding here.
http://www.chemteam.info/SigFigs/SigFigs.html

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