Factor the difference of squares.81a2 - 81b2
A. 81(a - b)2
B. (9a - b)(9a + b)
C. (a + 9b)(a - 9b)
D. 81(a + b)(a - b)
Answer: D
Mathematics
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+ C
C. 
sin-1
+ C
D. 
tan-1
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Choose the inequality that corresponds to the graph:
A. y < x2 B. y ? x2 C. y ? x2 D. y > x2
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Solve.A projectile is thrown upward so that its distance above the ground after t seconds is 
After how many seconds does it reach its maximum height? Round to the nearest second.
A. 27 sec B. 36 sec C. 11 sec D. 9 sec
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Give the exact value of the expression.cos 
A. 
B. 
C. 
D. 
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