Search the Internet to find out how to properly add or subtract numbers while taking into consideration

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Search the Internet to find out how to properly add or subtract numbers while taking into consideration the number of significant digits. Write a summary of the proper technique, then use the technique to solve the following cases: 

(a) 1.006 + 23.47, 

(b) 703,200 – 80.4, and 

(c) 4.6903 – 14.58.

Be careful to express your final answer to the appropriate number of significant digits.

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