(1.8 x 10^-2) = (9 x 10^2) =
2 x 10-5
2.0 x 10-5
O 0.2 x 10-4

0.2 x 10⁻⁴

Explanation:

The problem here is to evaluate:

          (1.8 x 10⁻²)  ÷  (9 x 10²)

To solve this problem, some certain rules of indices must be followed. In the event that we have an expression such as:

        (a x bˣ ) ÷ (c x bᵃ)  =  x  bˣ⁻ᵃ

So;

(1.8 x 10⁻²)  ÷  (9 x 10²)   = x  10⁻²⁻²

                                      = 0.2 x 10⁻⁴