Given matrix A, find the indicated cofactor.Find A12.A = 
A. -14
B. -9
C. 9
D. -7
Answer: C
Mathematics
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Find the mean.2.20, 19.04, 14.77, 12.38, 18.20, 4.25, 9.21, 2.08
A. 10.27 B. 9.13 C. 2.14 D. 8.86
Mathematics
Use the laws of exponents to simplify each expression using positive exponents only. Assume all variables represent nonzero real numbers.
A. 
B. 
C. 
D. 
Mathematics
Convert as indicated.31.4 g to kilograms
A. 0.00314 kg B. 31,400 kg C. 0.0314 kg D. 3140 kg
Mathematics
Rewrite the expressions with rational exponents as radical expressions, and then solve the equation.(10 - 9z)1/3 - (5 + 7z)1/3 = 0
A. 
B. ?
C. 
D. 
Mathematics