Find the union of the sets.{-6, -2, 2, 7} ? {-4, 0, 4, 9}
A. {-6, -4, -2, 0, 2, 4, 7, 9}
B. ?
C. {0}
D. {-2, 0, 2}
Answer: A
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Provide an appropriate response.The following equations each describe the motion of a particle. For which path is the particle's velocity vector always orthogonal to its acceleration vector?(1) r(t) = t4i + t4j(2) r(t) = cos (7t)i + sin (2t)j(3) r(t) = ti + t3j(4) r(t) = cos (-4t)i + sin (-4t)j
A. Path (2) and Path (4) B. Path (4) C. Path (3) D. Path (1)
Solve the problem.A reservation clerk worked 15.3 hours one day. She spent twice as much time entering new reservations as she did verifying old ones and one and a half as much time calling to confirm reservations as verifying old ones. How much time did she spend entering new reservations?
A. 13.6 hours B. 3.4 hours C. 5.1 hours D. 6.8 hours
Solve by the substitution method.x + 6y = -62x + 7y = -12
A. {(-6, 0)} B. {(6, -1)} C. {(x, y)|x + 6y = -6} D. ?
Factor the expression completely, if possible.z3 + 512
A. (z + 8)(z2 + 64) B. (z - 512)(z2 - 1) C. (z - 8)(z2 + 8z + 64) D. (z + 8)(z2 - 8z + 64)