Find the unit tangent vector of the given curve.r(t) = (10t cos t - 10 sin t)j + (10t sin t + 10 cos t)k
A. T = (10 cos t)j - (10 sin t)k
B. T = (-10 sin t)j + (10 cos t)k
C. T = (-sin t)j + (cos t)k
D. T = - 
(sin t)j + 
(cos t)k
Answer: C
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who are single. What is the ratio of members who are married to members who are single?
A. 
B. 
C. 
D. 