Express each of the following statements in symbols, using <, >, ?, or ?.r is negative.
A. r ? 0
B. r < 0
C. r ? 0
D. r > 0
Answer: B
Mathematics
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Factor completely.81x2 + 90xy + 25y2
A. (9x + 5y)2 B. (9x - 5y)2 C. (81x + 1)(x + 25) D. (9x + 5y)(9x - 5y)
Mathematics
Refer to the weighted voting system 
and the Banzhaf definition of power. (The four players are P1, P2, P3 and P4.)Which players are critical in the coalition {P1, P2, P3, P4}?
A. P1 only B. All of the players C. P1 and P2 only D. P1, P2 and P3 only E. None of the players
Mathematics
Find the exact value by using a half-angle identity.tan 75°
A. 2 + 
B. -2 - 
C. -2 + 
D. 2 - 
Mathematics
Simplify.
+ 
A. 
B. 
C. 
D. 5m+ 5
Mathematics