15 plus what equals -30?

Answer 1

-15

Answer 2

15 + (-45) = -30.

Answer 3

15 plus -45 equals -30. This is because when you add a positive number (15) to a negative number (-45), you are essentially subtracting the absolute value of the negative number from the positive number. In this case, the absolute value of -45 is 45, so 15 - 45 equals -30.

Answer 4

??? seriously? Nobody can give an answer? im not gonna work with negatives so...

15 plus x equals 30.

15 plus 15 equals 30.

Answer 5

15

Answer 6

cb