Convert each number into decimal form $($ordinary notation$).$ Watch sig figs.

a$.4\mathrm{.}23{10}^{-4}$

b$.9\mathrm{.}99{10}^{-2}$

c$.4\mathrm{.}23{10}^{-1}$

d$.9\mathrm{.}66{10}^2$

e$.4\mathrm{.}35{10}^4$

f$.4\mathrm{.}23{10}^1$