I believe C is correct,
Also, did you finish the equation for letter D?
That would be the commutative property
10,800 would be the best awnser for you
By greater if you mean faster, then you are comparing the fractions 11/10 and 7/6. Finding a common denominator, which is thirty, we get the fractions 33/30 and 35/30. We can see that 35>33, making Song B faster.
Um 3 unless she gave them away to her brother then she still would have 6