Solve. Express your answer as a signed number.In 7 weeks, the value of Bob Treatman's day trading account decreased by $231. What was the average weekly change in the value of the account?
A. -$39 per week
B. $31 per week
C. -$33 per week
D. -$35 per week
Answer: C
Mathematics
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A. 
B. 
C. 
D. 
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