Multiply the expressions.(9x + 7)(9x - 7)
A. 81x2 + 126x - 49
B. 81x2 - 49
C. x2 - 49
D. 81x2 - 126x - 49
Answer: B
Mathematics
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A. f(x) = 
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Decide whether or not the transition matrix is regular.
A. Yes B. No
Mathematics