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## Homework Equations

I know that I need to use T

^{2}over r

^{3}= T

^{2}over r

^{3}

## The Attempt at a Solution

I tried converting the moon's period (27.3 days) to ms and putting the 35 ms into ms per day into ms per century, but that yielded no results, since the number was so small the ms/day didnt change the moon's period at all in my calculator, maybe im supposed to do this one by hand? This method doesn't seem feasible sicne i will have to be squaring things, can someone help me?