The position vector of a particle is r(t). Find the requested vector.The acceleration at t = 
for r(t) = (10t - 5t3)i + 2tan(3t)j + e3tk
A. a
= - 
?i - 72j + 9e1/4?k
B. a
= - 
?i - 72j + 9k
C. a
= - 
?i + 72j + 9e1/4?k
D. a
= 
?i + 72j + 9e1/4?k
Answer: C
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Divide, if possible.
A. -25
B. 25
C. - 
D. -35
Write the first n terms of the given arithmetic sequence (the value of n is indicated in the question).The first term is -1 + 
, and the common difference is 5; n = 3
A. -1 - 
, 4 + 
, 9 + 
B. -1 + 
, 5 + 
, 10 + 
C. -1 + 
, 4 + 
, 9 + 
D. 1 + 
, 4 + 
, 9 + 
Solve the absolute value equation.
- 1 = -5
A. 
B. 
C. 
D. ?
Identify the conic that the polar equation represents. Also, give the position of the directrix.r = 
A. ellipse, directrix is perpendicular to the polar axis at a distance 
units to the right of the pole
B. ellipse, directrix is perpendicular to the polar axis at a distance 3 units to the left of the pole
C. hyperbola, directrix is perpendicular to the polar axis at a distance 3 units to the right of the pole
D. hyperbola, directrix is perpendicular to the polar axis at a distance 
units to the left of the pole