The pair of triangles is similar. Find the missing length.
A. 4
B. 3
C. 6
D. 9
Answer: C
Mathematics
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Find the unit tangent vector T and the principal unit normal vector N. r(t) = 
(1 + t)3/2i + 
(1 - t)3/2j + 
tk
A. T = 
i + 
j + 
k; N = 
i + 
j
B. T = 
i - 
j + 
k; N = 
i + 
j
C. T = 
i - 
j + 
k; N = 2
i + 2
j
D. T = 
i - 
j + 
k; N = 
i + 
j
Mathematics
Find the nth term of the given infinite series for which 
2 + 
+ 
+ 
+ ...
A. 
B. 
C. 
D. 
Mathematics
Solve the problem.(a)What area does the integral 
represent?(b)Use a graphing utility to approximate the area to three decimal places.
What will be an ideal response?
Mathematics
Evaluate.Evaluate 
for x = -12 and y = 3.
A. 9 B. -4 C. -9 D. 4
Mathematics