Recall that the signs
[tex]+,\text{ and -}[/tex]
helps us indicate if there is an increase or a decrease.
If the number represents a decrease from the previous one, we put a minus sign. If the number represents an increase then we put a plus sign.
Notice that Ivanna lost $40, therefore, the total money she had decreased by 40.
If the company produced 540 more cars this month than last month, then there was an increase of 540 in cars production.
Answer:
(a)
[tex]-40.[/tex]
(b)
[tex]+540.[/tex]
