Find the curvature ? for the given function.r(t) = (3t sin t + 3 cos t)i + 3j + (3t cos t - 3 sin t)k
A. ? = 3t
B. ? = - 
C. ? = 
D. ? = 
Answer: D
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Fill in the blank(s) with the appropriate word(s).
Solve.An express train travels 267 miles between two cities. During the first 
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A. 8.1a + 8.8b B. 4.7a + 8.8b C. -4.7a + 4.0b D. 4.7a + 4.0b