Factor the sum of cubes.27a6 + b3a3
A. (3a2 + ba)(9a4 - 3ba3 + b2a2)
B. a3(3 + ab)(9 - 3ab + b2a2)
C. a3(3a - b)(9a2 + 3ab + b2)
D. a3(3a + b)(9a2 - 3ab + b2)
Answer: D
Mathematics
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Find the cardinal number for the set.F = {x ? x ? N and x < 0}
A. n(F) = 0 B. n(F) = 1 C. n(F) = 2 D. n(F) = 100
Mathematics
Perform the indicated operation. Simplify the result.
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A. 
B. 
C. 
D. 
Mathematics
Factor and simplify.sec4 x - 2 sec2 x tan2 x + tan4 x
A. sec2 x (1 + tan2 x) B. 2 C. 1 D. sec2 x + tan2 x
Mathematics
Use the tree diagram to find the requested probability.Find P(X?A). Give your answer as a decimal and round your answer to three decimal places if necessary. 
a = 0.9, b = 0.1, c = 0.8, d = 0.2, e = 0.6, f = 0.4
A. 0.514 B. 0.72 C. 0.923 D. 0.8
Mathematics