Answer:
10
Step-by-step explanation:
Determinant = ad - bc

number 9 =al you have to do is one and 7 eighths =9 so your sum will be 10 and 7 eighths.
hope this helps;)
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Answer:
I think 2 points
Step-by-step explanation:
I may be wrong bc I suck at algebra. literally who is gonna use algebra ever?
Answer:
12
Step-by-step explanation: