Final answer:
The expression -7 + (-6) is solved by adding the two negative numbers together, resulting in -13. Therefore, the answer is (a) -13.
Step-by-step explanation:
To solve the expression -7 + (-6), you simply add the two negative numbers. When you add two negative numbers, you are essentially combining their absolute values (ignoring the negative signs for a moment) and then applying the negative sign to the result.
So, the solution is as follows:
- -7 + (-6) = - (7 + 6)
- = - (13)
- = -13
Therefore, the correct answer is (a) -13.