Use a reference angle to find the exact value of the expression.cos 210°

A.  
B.  
C. - 
D. - 


Answer: D

Mathematics

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Find all the roots of the given equation.x4 - 81 = 0

A. -3, -3j, 3, 3j B. -3 - 3j, -3 + 3j, 3 - 3j, 3 + 3j C. -3, 3 D. -3j, 3j

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Provide an appropriate response.Write x ? x ? x ? x ? x ? x using exponents.

A. 6x B. 6 C. 6(x) D. x6

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Graph the solution of the system of linear inequalities.

A.

B.

C.

D.

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Solve the equation.log (x + 8) -1 = 0

A. -5 B. 992 C. 9992 D. 1008

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