For the following exercises, decide if the function continuous at the given point. If it is discontinuous, what type of discontinuity is it$?$

$143)$f$($x$)=\{$x$2$exx$1$ifx$<0$ifx$>=0,$

at x$=0$

In the following exercises, find the value$($s$)$ of k that makes each function continuous over the given interval.

$145.$ f$($x$)=\{3$x$+2,2$x$3,$x