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[tex] 3^{2} [/tex] + 474 equals 483.

First, multiply 3 two (3x3) times to get 9. Your problem should look like: 9 + 474.
Second, add 9 + 474 to get 483, which is the correct answer.
The answer is 483.

You have to multiply 3 times 3. That is what 3² power means. 
Then you have to add 474 + 9 and that equals 483.