$1\mathrm{.}9$ Complete the following, determining the appropriate uncertainty:

$($a$)(2\mathrm{.}70\backslash$pm $0\mathrm{.}05$ cm$)2$

$($b$)(2\mathrm{.}70\backslash$pm $0\mathrm{.}07$ cm$)3$

$($c$)(12\mathrm{.}02\backslash$pm $0\mathrm{.}08$ cm$)4$

$($d$)(20\mathrm{.}6\backslash$pm $3\%)2$

$($e$)(23\mathrm{.}6\backslash$pm $14\%)3$