The numbers 23.982 and 3.4687 are both approximate and correct only to their last digits. Find their difference and state how many figures in the result are trustworthy.
Find their difference?
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23.982-3.4687 = 20.513, which contains 5 significant figures.
Attn: Since the result of addition or subtraction should be no more accurate than the least accurate one.
Sun, what does your teacher expect? I would assume your teacher would have covered the definition of "trustworthy figures" to you at some point. Without knowing if this is a specific math problem (and no more), or if there's another part to this question (as with a statistical analysis or interpreting the results of a scientific study), it's difficult to answer your question.