Use an appropriate identity to find the exact value of the expression.cos 
A. - 
B. 
C. 
D. 
Answer: D
Mathematics
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Match the system of inequalities with one of the graphs.x2 + y2 < 16 y ? 1
A. 
B. 
C. 
D. 
Mathematics
Solve using the multiplication principle.4b = -64
A. 68 B. -16 C. -68 D. 1
Mathematics
Express the number in decimal notation.8.1 × 105
A. 81,000 B. 8,100,000 C. 405 D. 810,000
Mathematics
Discuss the equation and graph it.r = 
A. hyperbola, directrix perpendicular to
the polar axis 
unit right of the pole
vertices (
, 0), (- 
, ?)
B. ellipse, directrix perpendicular to
the polar axis 
unit left of the pole
vertices (
, 0), (
, ?)
C. ellipse, directrix parallel to
the polar axis 
unit below the pole
vertices (
, 
), (
, 
)
D. hyperbola; directrix parallel to
the polar axis 
unit above the pole
vertices (
, 
), (- 
, 
)
Mathematics