Write in terms of i.
A. 9i
B. ±9
C. -9i
D. i
Answer: A
Mathematics
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Solve the equation for solutions in the interval [0°, 360°).cos 2? = 
A. 3 B. ? = 30°, 90°, 150°, 270° C. ? = 0°, 120°, 180°, 240° D. ? = 105°, 165°, 285°, 345° E. ? = 15°, 165°, 195°, 345°
Mathematics
Evaluate h (3), where 
?
, 
?
A. 
B. 
C. 
D. 
E. 
Mathematics
Which method should be used to solve the system? Explain your answer, including a description of the first step. x2 - 7y2 = 910x2 + 9y2 = 100
What will be an ideal response?
Mathematics
Divide if possible.72 ÷ 72
A. 1 B. 72 C. Undefined D. 0
Mathematics