Choose a number line to model the following situation:

Marcy owed her friend Erica $25 dollars and paid her back $15.

Question

Choose a number line to model the following situation: 

Marcy owed her friend Erica $25 dollars and paid her back $15.

gentorr · Answer

attachment

gentorr · Answer

@Michele_Laino

triciaal · Answer

hint: when you owe you are in the red   you are negative 
when you add you go right

calculusxy · Answer

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?

michele_laino · Answer

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

gentorr · Answer

i think its the first one