Question

Sherrie borrowed money from her parents to buy a new phone. The amount she owes them in dollars can be represented by the integer . Sherrie also did some babysitting this month. The amount of money she made in dollars can be represented by the integer . If Sherrie had no other income or expenses, which integer represents her total worth in dollars?

Answer 1

To find the integer that represents her total worth, add the integers that represent her debt and that of her income:

$-88+145$

The expression can be rearranged by commutativity as:

$145-88$

Find the difference:

$57$

Since this is a positive number, it can be written as:

$+57$

Hence, the fourth option is the correct answer.