Me asap plz

create a problem that show the rational numbers are closed under addition, subtraction, and multiplication (total of 3 problem). show the work to prove that your problem is closed.

Im not sure what your asking 

Yes, that's exactly it. Multiplying 1/3 by 9% will give you the amount of additioal volume that will be added when the water freezes, but to get the total volume of the ice, you'll have to add that addtional amount to the amount before freezing. The other way to do this is multiplying 1/3 by 109% (that's the same as multiplying it by 1.09).

Ive seen this before! the answer is b