Which of the following are syntactically correct Python assignment statements? Here, you can assume all the variables are already defined. Select ALL that are correct.

Question $6$Select one or more:

cooking$\_$time $=$ total$\_$time $/2$

car$\_$speed $+5=$ current$\_$speed

cooking$\_$time $=$ cooking$\_$time $-50$

cooking$\_$time $=40+(15/7)$

$3\mathrm{.}1415=$ pi

average $=$ total $/$ numbers