Find the center of mass of the wire that lies along the curve r and has density ?.r(t) = (7t2 - 1)i + 2tk, -1 ? t ? 1; 
A. 
B. 
C. 
D. 
Answer: C
Mathematics
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Solve the problem.Show that the midpoint of the hypotenuse of a right triangle is equidistant from all three vertices. [Hint: See the figure below. Show that 
= 
.] 
What will be an ideal response?
Mathematics
Sketch the curve.4x2 + 25y2 = 100
A. 
B. 
C. 
D. 
Mathematics
Evaluate the expression.(-5)0 + (-14)0
A. 2 B. -2 C. -19 D. 0
Mathematics
Find the foci of the ellipse.7x2 + 2y2 + 14x - 16y + 25 = 0
A. (-1 + 
, 4) , (-1 - 
, 4)
B. (-1, 4 + 
) , (-1, 4 - 
)
C. (1, -4 + 
) , (1, -4 - 
)
D. (-1, 4 + 
) , (-1, 4 - 
)
Mathematics