Use the Gauss-Jordan method to find A-1, if it exists.A = 

A.

B.

C.

D. Does not exist

Answer: D

Mathematics

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Find the exact value of the expression.cos  cos  - sin  sin 

A. 0
B. 1
C. -1
D.

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Write the expression in the standard form a + bi.2

A. - 
B. i
C.
D. -i

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Evaluate.-3 - 22

A. 19 B. 25 C. -19 D. -25

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Find a quadratic model for the sequence with the indicated terms. ? a0 = -3, a2 = 2, a4 = 10 ?

A. an= n2 - n - 3              
B. an = 3n2 + n + 
C. an = n2 + n + 3
D. an = n2 + n - 3
E. an= -3n2+ n +   

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Mathematics