Answer:
-7/5
Step-by-step explanation:
5/7
= -7/5
When you are multiplying exponents with the same base, you can add the exponents. This is represented as:

In our case we are multiplying exponents with the same base 8 and exponents -7 and 5. The sum of -7 and 5 is -2, so our answer is
.
An 18% increase. I just used my handy dandy calculator.
B. 2
if any other number was in there i dont think it would work because its neg