Math

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1. Is it more appropriate to use scientific notation for approximates or exact numbers? why?

2. In one plantation, there are 2700 young trees correct to 2 significant figures. In the other there are 830 full grown trees, correct to 2 significant figures.

a) Why is it incorrect to say the company has a total of 3530 trees in two plantations, correct to 2 significant figures?

b) On the figures given, what is the least number of trees they could have in the two plantations?

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