Find the indicated vector.Let u = 
. Find 2u.
A. 
B. 
C. 
D. 
Answer: D
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Solve the problem.A region in the first quadrant is bounded above by the curve y = tanh x, below by the 
on the left by the 
and on the right by the line 
Find the volume of the solid generated by revolving the region about the x-axis.
A. ?
B. 0
C. 2?
D. - 
Factor by grouping.18x4 + 12x2y4 - 15x2y4 - 10y8
A. (18x2 - 5y4)(x2 + 2y4) B. (6x2 + 5y4)(3x2 - 2y4) C. (6x2 - 5y4)(3x2 + 2y4) D. (6x2 - 5y)(3x2 + 2y8)
Graph the quadratic equation. Identify the vertex and the intercept points with their coordinates.y = 5x2 
A. Vertex: (0, 5);
x-intercepts: none;
y-intercepts: none
B. Vertex: (0, 0);
x-intercepts: none;
y-intercepts: none
C. Vertex: (0, 0);
x-intercepts: none;
y-intercepts: none
D. Vertex: (0, 0);
x-intercepts: none;
y-intercepts: none
Solve.A projectile is thrown upward so that its distance above the ground after t seconds is 
After how many seconds does it reach its maximum height?
A. 28.5 sec B. 13 sec C. 9 sec D. 38 sec