Because you can wright:
and so you get:
I know you add the indices if you're multiplying something with the same base, but what do you do if it's got the same base with a negative sign? (And could you provide extra examples? pretty please?)
10^4 * (-0.1)^3
= 10^4 * (-10)^-3
= -(10)^(4-3) <--Is this right?