Simplify, if possible, by combining like terms.-2a - 7a + 4a
A. -9a2 + 4a
B. -5a3
C. -9a + 4
D. -5a
Answer: D
Mathematics
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A. 
B. 
C. 
D. 
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Simplify.(8x - 2y + 5) - 2(-8x + 2y - 5)
A. 24x - 6y + 15 B. 16x - 4y + 10 C. -16x + 4y - 10 D. -24x + 6y - 15
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Use a half-angle formula to find the exact value of the expression.sin 165°
A. 
B. - 
C. - 
D. 
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Write the complex number in polar form. Express the argument ? in degrees, with 0 ? ? ? 360°.9
+ 9i
A. 18( cos 300° + i sin 300°) B. 18( cos 30° + i sin 30°) C. 18( cos 330° + i sin 330°) D. 18( cos 60° + i sin 60°)
Mathematics