Answer:
B. x+6.4<9.9
Explanation:
The 'sum' tells you that it is adding and less than is this symbol: <.
B. X+6.4<9.9
The sum of a number is represented by X. So X and 6.4 is X+6.4. Is less than 9.9, so <9.9. You get X+6.4<9.9.
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