Your answer would be 4x-6y-12
A) this is not enough information to compare the mode.
For example:
{1,1,6,11,11]: mean 6, median 6, mode 1 and 11
{4,4,6,8,8} mean 6, median 6 mode, mode 4 and 8
The answer is 5 hope it helps
I believe A and B are the ones. As for explaining? hmm. I would honestly say that any number to the right of a number is a tenth of the place above it. But then again, it's optional to explain ;P