Answer:
[tex]-100[/tex] [tex]dollars[/tex]
Step-by-step explanation:
Wally takes out $40 dollars out of his bank account every week, then we know that he has $100 dollars to begin with,
Meaning that for 4 weeks, we have to $40 dollars out of $100.
[tex]1^{st}[/tex] [tex]time[/tex] :
$100 - $40
==> $60
[tex]2^{nd}[/tex] [tex]time[/tex] :
$60 - $40
==> $20
[tex]3^{rd}[/tex] [tex]time[/tex] :
$20 - $40
==> -$60
[tex]Last[/tex] [tex]time[/tex] :
-$60 - $40
==> -$100
