carry out the following operations as if they were calculations of experimental results. express each anser in the correct units with the correct number of significant figures (3 x 10^4 g +6.827g)/(0.043cm^3 - 0.021 cm^3)

acid rain does not usually kill trees directly. instead, it is more likely to weaken the trees by damaging their leaves, limiting the nutrients available to them, or poisoning them with toxic substances slowly released from the soil. the main atmospheric pollutants that affect trees are nitrates and sulphates.

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