Remove or add parentheses as indicated.Rewrite (p + q)(p - q) without parentheses.
A. p2 + q2
B. p2 - q2 + 2pq
C. p2 - q2 - 2pq
D. p2 - q2
Answer: D
Mathematics
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that are closest to the origin.
A. (343, ±
)
B. (343, 
)
C. (7, ±7
)
D. (7, 7
)
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Solve the problem.A flare fired from the bottom of a gorge is visible only when the flare is above the rim. If it is fired with an initial velocity of 112 ft/sec and the gorge is 160 ft deep, during what interval can the flare be seen? 
A. 6 sec < t < 9 sec B. 0 sec < t < 2 sec C. 4 sec < t < 7 sec D. 2 sec < t < 5 sec
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Find a ? b.a = 4i + 5j, b = 2i + 4j
A. 
B. 28
C. 
D. 12
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Graph the equation.25y2 - 9x2 = 225
A. 
B. 
C. 
D. 
Mathematics