Find the unit tangent vector of the given curve.r(t) = (2 - 2t)i + (2t - 6)j + (7 + t)k
A. T = - 
i + 
j + 
k
B. T = 
i - 
j - 
k
C. T = 
i - 
j - 
k
D. T = - 
i + 
j + 
k
Answer: D
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The main incentive for a U.S. company to form a strategic alliance with a South African company is to
A. develop a competitive advantage. B. achieve immediate profit increases. C. form an international relationship that might be useful in the future. D. prevent South African competitors from moving into the U.S. market.
Evaluate the expression.
2
A. - 
B. - 
C. 
D. 
Write the fraction in lowest terms.
A. 
B. 
C. 
D. 
Identify the vertex, axis, domain, and range of the parabola.f(x) = - 
(x + 2)2 + 1
A. vertex: (-2, 1) axis: x = -2 domain: (-?, ?) range: [1, ?) B. vertex: (-2, -1) axis: x = -2 domain: (-?, ?) range: [1, ?) C. vertex: (-2, 1) axis: x = -2 domain: (-?, ?) range: (-?, 1] D. vertex: (-2, -1) axis: x = -2 domain: (-?, ?) range: (-?, -1]