Find the cofactor of the indicated element of the matrix shown.a12;
A. -21
B. 23
C. 21
D. -12
Answer: A
Mathematics
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A. 
B. 
C. 
D. 
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The following figure has perimeter, circumference, or area as indicated. Find the value of x. Use 3.14 as an approximation for ?.A = 10
A. 2 B. 0 C. 5 D. 7
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Evaluate the integral.
A. 
B. 
C. 
D. 
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