Please help me I don’t understand.

Total change in money:-
[tex]\\ \tt\longmapsto 15+(-65)+40+(-15)[/tex]
[tex]\\ \tt\longmapsto 15-65+40-15[/tex]
[tex]\\ \tt\longmapsto 15-15-65+40[/tex]
[tex]\\ \tt\longmapsto -25\$[/tex]
Now.Current balance:-
[tex]\\ \tt\longmapsto 95-25=\$70[/tex]
Answer:
$70.
Step-by-step explanation:
Balance = 95 + 15 - 65 + 40 - 15
= 110 - 65 + 40 - 15
= 45 + 40 - 15
= 85 - 15
= $70.