Add or subtract as indicated. Write the answer in simplest form.
+ 
+ 
A. 
B. 
C. 
D. 
Answer: C
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Find the unit tangent vector of the given curve.r(t) = (4t cos t - 4 sin t)j + (4t sin t + 4 cos t)k
A. T = - 
(sin t)j + 
(cos t)k
B. T = (4 cos t)j - (4 sin t)k
C. T = (-4 sin t)j + (4 cos t)k
D. T = (-sin t)j + (cos t)k
Use implicit differentiation to find dy/dx.x = sec(9y)
A. 9 sec(9y) tan(9y)
B. 
cos(9y) cot(9y)
C. 
sec(9y) tan(9y)
D. cos(9y) cot(9y)
Find the derivative.s = t3 tan t - 
A. 
= t3 sec2 t + 3t2 tan t - 
B. 
= t3 sec t tan t + 3t2 tan t - 
C. 
= - t3 sec2 t + 3t2 tan t + 
D. 
= 3t2 sec2 t - 
The graph shows the average time spent doing homework. Use the graph to answer the question. 
If 4100 students were surveyed, what total number of students answered "Over 55 minutes" and "Other"?
A. 102.5 students B. 20.5 students C. 82 students D. 123 students