2x1,000,000
9x100,000
3x10,000
7x1,000
0x100
8x10
2x1
Plug in x and y into the equations and see which one comes out true...
Also, K12 person huh?
a+b cannot be simplified any further.
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hope it helps
Answer:
The answer would be D or 4 or whatever you would like to call it (the bottom one)