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Answer:
C. 3×m
Step-by-step explanation:
In algebra we are doing arithmetic with just one new feature − we use letters to represent numbers. Because the letters are simply stand-ins for numbers, arithmetic is carried out exactly as it is with numbers. In particular the laws of arithmetic (commutative, associative, and distributive) hold.
(Triple means 3 times so... In summary, the answer is 3×m)