Q: What is 9 plus 9 plus 9 plus 9 equals?

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If I am correct, 9 plus 7 equals 112.

9+9+9+9+9+9+9=63

9 plus 7 equals 144. Generally, x plus y = x(x+y).

The additive property.

27 + 9 = 36

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9 plus 87 equals 96.

12 plus 9 equals 21.

No! It equals 15, but 9-6=3.

96

If I am correct, 9 plus 7 equals 112.

144 9+7 = 16 and 9*16 = 144

The answer is 144. The compound operator for (a) and (b) in each pair is a * (a+b). For 9 and 7, this is 9 x (9+7) = 9 x 16 = 144.

9+9+9+9+9+9+9=63

The answer to the problem of 13 equals -4x plus 9 is x equals -1.

3x plus 9 equals what?

9 - 5n

18