Choose a number line to model the following situation:
Marcy owed her friend Erica $25 dollars and paid her back $15.
Stacey Warren - Expert brainly.com
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Zero would be the amount that Marcy had previously. However, she borrowed $25 from her friend, which means that from her balance, she knows that she needs to give back that $25 (thus it is negative). However, she has only paid back $15, that means that she has only $10 remaining to give back and then she will get out from the negative range, so the arrow went to the right.
From this information that I have given you, can you tell me what number line that would be?
your problem can be modeled by this expression:
\[\Large - 25 + 15\]
since negative numbers are used to represent debts, whereas positive numbers are used to represent credits