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
Mathematics
Provide an appropriate response.Write x ? x ? x ? x ? x ? x using exponents.
A. 6x B. 6 C. 6(x) D. x6
Mathematics
Graph the solution of the system of linear inequalities.
A. 
B. 
C. 
D. 
Mathematics
Solve the equation.
log (x + 8) -1 = 0
A. -5 B. 992 C. 9992 D. 1008
Mathematics