Answer:
B. 12
Step-by-step explanation:
This is pretty much basic substitution :)
1. Substitute the a and b with the given values. That leaves us with [tex]-6\left(-2\right)^{-3}\left(4\right)^{2}[/tex] .
2. Solve following the Order of Operations, that leaves us with 12.
•This are the rules in case you're wondering:
First do all operations that lie inside parentheses.
Next, do any work with exponents or radicals.
Working from left to right, do all multiplication and division.
Finally, working from left to right, do all addition and subtraction.
