Solve the inequality.x2 + 4x ? 0
A. [0, 4]
B. [-4, 0]
C. (-?, 0] or [4, ?)
D. (-?, -4] or [0, ?)
Answer: D
Mathematics
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Use a half-angle identity to find an exact value for the following, given the information about x. Find cos x given that cos 2x = 
and 0 ? 2x < 
.
A. cos x = 7
B. cos x = 
C. cos x = 
D. cos x = 
Mathematics
Answer true or false.{10, 16, 28, 48} ? {2, 4, 6, 8, ..., 98}
A. True B. False
Mathematics
Write true or false for the statement.A meter is longer than an foot.
A. True B. False
Mathematics
Find the determinant of the given matrix.
A. 7 B. -7 C. 5 D. -5
Mathematics