-108 If you add them together you will get 0 Becuase positive and negative don't go together it's like this 108 positive + Negative 108 won't go together it will turn out to be zero Hope this helps
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Answer:
68$
Step-by-step explanation:
cost of 10 book= 10$ * 10= 100$
now,
Remaining money= 168$-100$
=68$
2.25h(60m/hr)(1/3)=45m
So Rick spends 45 minutes studying math per night.