Find the direction angle ? for the given vector. Let 0° ? ? < 360° and round ? to the nearest tenth when appropriate.
A. 144°
B. 180°
C. 270°
D. 90°
Answer: B
Mathematics
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= - 
A. - 
B. 
C. - 
D. 
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A. {-4, -1} B. {1, 4} C. {-3, 8} D. {-8, 3}
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Find the constant that should be added to the expression to make it a perfect square.x2 + 16x + ?
A. 256 B. 64 C. 8 D. 16
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