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Maria walks a round trip of 0.75 mile to school every day.how many miles will she walk in 4.5 days

Find the greatest common factor of the followig monomials 21u^5v,3u^4v^6, and 3u^2v^5

He mass of a single atom of carbon can be found by dividing the atomic mass (12.01 g) by 6.022 x 10^23. which is the mass of a single carbon atom, correctly written in scientific notation with the correct number of significant figures?