18
30! 29
6 + 9 + 8 = 23
7609
-7
No, 10 plus 9 cannot equal 21. The correct sum of 10 and 9 is 19. The statement that 10 plus 9 equals 21 is mathematically incorrect.
28 + 9 + 32 + 7 = 76
9+8=17.
8 + 9 = 17
ok you guys and hoes 9+d equal -5
1 plus negative 10 is equal to -9.
-3
37