Perform the indicated operation. Write the answer in simplest form.
? 
A. 
B. 
C. 
D. 
Answer: A
Mathematics
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Find the unit vector having the same direction as v.v = 9i
A. u = 
i
B. u = i
C. u = 81i
D. u = 9i
Mathematics
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 160 ft/sec, and the gorge is 336 ft deep, during what interval can the flare be seen? 
A. 9 < t < 13 (seconds) B. 0 < t < 3 (seconds) C. 6 < t < 10 (seconds) D. 3 < t < 7 (seconds)
Mathematics
Factor the trinomial completely.4x3 - 32x2 + 60x
A. x(4x - 20)(x - 3) B. x(x - 5)(4x - 12) C. 4(x2 - 5x)(x - 3) D. 4x(x - 5)(x - 3)
Mathematics
Describe the graph using another equation.y = cos 
- cos 
A. -sin x B. -cos x C. -2sin x D. -2cos x
Mathematics