Question

Those are the questions

Answer 1

Step-by-step explanation:

We need to know

$a^{-1} =\frac{1}{a}$

so

(a)

5^x = 125^(-1)

5^x = 5^(-3)

x = -3

(b)

3^(-3) * 10^(-3)

= (3*10)^(-3)

=1/27000