Answer:
-39
Step-by-step explanation:
Negative+Negative=Negative
Positive+Positive=Positive
Answer:
[tex]-39[/tex]
Step-by-step explanation:
1) Use this rule: [tex]-a-b=-(a+b)[/tex]
[tex]-(30+9)[/tex]
2) Use the alogrithm method.
3 0
+ 9
---------
3 9
3) After simplification, we have:
[tex]-(30+9)=-39[/tex]
4) Therefore, [tex]-30 - 9 = -39[/tex]
[tex]-39[/tex]
