No.
-4 plus 10 equals 6.
few errors in your title: 2 plus 4 = 6 6 plus 9 = 15 10 plus 25 = 35 18 + 81 = 99
9/15 + 10/15 = 1 and 4/15
A equals 4 because 4 plus 6 is 10 or 10 minus 6 is 4.
-15 + 4 = -11
4/25 + 2/15 = 12/75 + 10/75 = 22/75
Yes.
true
That equals 28
false
The answer is 20. In each addition, the individual digits are added together (1+2+3+5+4 = 15)
20 = 400