Find the sum:

-21 + (-13) + (-9).

A. - 43

B. - 25

C. 1

D. 4

If you would like to solve - 21 + ( - 13) + ( - 9), you can calculate this using the following steps:

- 21 + ( - 13) + ( - 9) = - 21 - 13 - 9 = - 43

The correct result would be A. - 43.

The answer is A. - 43. All of thos additions of minus values are made substraction afterwards.