if a plus sight $1\mathrm{.}097$ m is taken on BM$,$ elevation $312\mathrm{.}547$ m and the minus sight $0\mathrm{.}832$ m is read on point $($x $)$ calcute the $($HI$)$ and the elevation point X $($True$)$ or False

$-$the elevation point can be determined by subtraction, the $($FS$)$ from $($HI$)$

$-$another name for a foresight reading is minus shot