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Answer :

Answer:

n + 9.2 = 12.9

Explanation:

whenever u see 'sum' or 'and', think addition. The equation will have a + sign

usually in an equation, the word 'is' means an = sign

So the sum (addition) of a number (n) and (+) 9.2 is (=) 12.9

n + 9.2 = 12.9