Evaluate this expression. 67.8 − (− 92.1) A) −139.5 B) −24.3 C) 159.9 D) 178.9
subtracting a negative is like adding a positive
To evaluate the expression 67.8 - (- 92.1), you need to perform the subtraction operation.
When subtracting a negative number, you can rewrite the expression as adding the opposite. In this case, we rewrite it as:
67.8 + 92.1
To add these two numbers, align the decimal points and add the digits:
```
67.8
+ 92.1
______
159.9
```
Therefore, the result is 159.9.
So, the correct answer is C) 159.9.