Answer:
A
Step-by-step explanation:
We can change the sign of an exponent if we change sides. This means sign of exponent changes when we move the number (along with base) from numerator to denominator or from denominator to numerator.
So 10 to the power -1 will change to 10 to the power 1 if we take the whole thing to the denominator (steps shown below):
[tex]-(10)^-1\\=-\frac{1}{10^1}\\=-\frac{1}{10}[/tex]
Answer choice A is right.
