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Which expression is equivalent to 4 square root 6 divided by 3 root 2

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?

If the sales price of a dvd is $20 and the markup is 34%, what is the cost of the dvd?