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If x = 1 and y = -1, then 13 (x+ y) = _____?

If x = 1 and y = -1, then 13 (x+ y) = _____?

Explanation

Substitute x = 1 and y = -1 into the expression:

13(x + y) = 13(1 + (-1)) = 13(0).

Therefore, 13(0) = 0.