Solve the inequality. Express your answer in set notation.x2 < 81
A. {x| x < -9 or x > 9}
B. {x| 9 < x < 9}
C. {x| -9 ? x ? 9}
D. {x| x < 9}
Answer: B
Mathematics
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Solve the equation for x.y = 8 cos 3x
A. x = 3 arccos 
B. x = 
arccos 
C. x = 8 arccos 
D. x = 
arccos 
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Determine whether the following is a difference of squares.t3 - 4
A. Yes B. No
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Find an equation for the ellipse described.Center at (0, 0); focus at (-2, 0); vertex at (5, 0)
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
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D. 
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Mathematics