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Verified Answer :

< Assume that the orbit of the earth is a circle with the radius of 1.5⋅1011 m. I need help on this one > 

Distance the earth covers in one year = 2 pi radius. The speed is the distance / time. 

< 1.8810^-6 > what are the units? 

Convert your time unit from 1 year to the same units. For example, if it's seconds, convert 1 year = seconds (3.16
10^7 seconds using 365 1/4 days per year). 

Calculate the distance the earth travels in one orbit divided by the time.