Solve the proportion.
Mathematics
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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
Mathematics
Provide an appropriate response.What does the graph of the equation 
look like?
A. The yz-plane B. The xz-plane C. The y-axis D. The x-axis
Mathematics
Perform the indicated operation. Simplify if possible.
- 5x
A. 
B. 
C. 
D. 
Mathematics
Solve the equation for the indicated variable. (Leave ± in your answer, when appropriate.)x = ± 
for r
A. r = ± 
B. r = ± 
C. r = x + y
D. r = ± 
Mathematics