Factor the difference of two squares.(16x4 - 81)
A. (4x2 + 9)(4x2 - 9)
B. (4x2 + 9)(2x + 3)(2x - 3)
C. (2x + 3)2(2x - 3)2
D. (4x2 + 9)(4x2 + 9)
Answer: B
Mathematics
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A. 
?
B. 
?
C. 
?
D. 265?
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Find the curvature of the space curve.r(t) = -4i + (t + 10)j +(ln(cos t) + 1)k
A. ? = sin t B. ? = cos t C. ? = sec t D. ? = csc t
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Find the surface area of the solid.
A. 142 m2 B. 105 m2 C. 210 m2 D. 71 m2
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The position vector of a particle is r(t). Find the requested vector.The velocity at t = 0 for r(t) = cos(4t)i + 3ln(t - 7)j - 
k
A. v(0) = 
j
B. v(0) = -4i - 
j
C. v(0) = 4i - 
j
D. v(0) = -
j
Mathematics