Factor completely. If prime, so state.x2 - 4xy - 21y2
A. (x - 7y)(x + 3y)
B. (x - y)(x + 3y)
C. (x + 7y)(x - 3y)
D. (x - 7y)(x + y)
Answer: A
Mathematics
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Subtract.8969
A. 8526 B. 3440 C. 3520 D. 3526
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Find the expected value of the random variable in the experiment.A bag contains six marbles, of which four are red and two are blue. Suppose two marbles are chosen at random and X represents the number of red marbles in the sample.
A. 1.4 B. 0.933 C. 1.33 D. 1
Mathematics
Find the requested angle.The complement of 13°.
A. 77° B. 257° C. 167° D. 347°
Mathematics
Determine the real solutions to the system of nonlinear equations.x2 - y2 = 39x - y = 3
A. (8, -5) B. (-8, 5) C. (8, 5) D. (-8, -5)
Mathematics