Tell whether the given equation describes a parabola, an ellipse, or a hyperbola.r = 
A. Ellipse
B. Hyperbola
C. Parabola
Answer: B
Mathematics
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If r(t) is the position vector of a particle in the plane at time t, find the indicated vector.Find the acceleration vector.r(t) = (3 ln(8t))i + (2t3)j
A. a = - 
i + 12tj
B. a = 
t-2i + 12tj
C. a = 
i + 6tj
D. a = - 
t-2i + 12tj
Mathematics
Perform the transformation.Write cot x in terms of sin x.
A. 
B. 
C. 
D. ± 
Mathematics
Graph the function.f(x) = 
A. 
B. 
C. 
D. 
Mathematics
Find the equation of the parabola passing through the given points.
?
, 
, and 
?
A. ?
B. ?
C. ?
D. ?
E. none of these
Mathematics