0
Anonymous
No, because 9+10 = 19
Wiki User
12 plus 9 equals 21.
A + 9 = 21 A = 21 - 9 A = 12
21
x ≠11 9 + x = 21 9 + x - 9 = 21 - 9 x = 12
If: x+9+5x = 21+2x Then: x = 3
No you can not prove that 9 +10 = 21.
9+10=21
6+4=10