9 plus 87 equals 96.
12 plus 9 equals 21.
No! It equals 15, but 9-6=3.
96
9+9+9+9 = 36
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