Final answer:
The fraction equivalent to [-6 - (-9)] / 8 after simplification is 3/8, as the subtraction of a negative number turns into addition, and -6 + 9 equals 3.
Step-by-step explanation:
To determine which fraction is equivalent to [-6 - (-9)] / 8, let's first simplify the expression in the numerator:
-6 - (-9) = -6 + 9 = 3
So we have 3 / 8. We can see that the expression is already positive, and thus we don't need to include a negative sign.
Therefore, the fraction equivalent to [-6 - (-9)] / 8 is b. 3/8.