Question

Concrete is made from sand, gravel and cement (which is made from shale, limestone, and the minerals quartz, gypsum, iron, alumina, manganese, and clay) Every year 4,700
lb of concrete is produced for every person in the United States, so that our roads, homes, schools, businesses, factones, and so on can be built or maintained.
Calculate how much concrete is produced for the class of 31 students in one calendar year.
Express your answer using three significant figures.​

Answer 1

Answer:

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