Compute the unit binormal vector and torsion of the curve. r(t) = 
A. B(t) = 
, ? = 
B. B(t) = 
, ? = 
C. B(t) = 
, ? = 
D. B(t) = 
, ? = 
Answer: B
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Solve the problem.In the formula A = Iekt, A is the amount of radioactive material remaining from an initial amount I at a given time t and k is a negative constant determined by the nature of the material. A certain radioactive isotope has a half-life of approximately 1,850 years. How many years would be required for a given amount of this isotope to decay to 55% of that amount?
A. 1,541 yr B. 1,596 yr C. 2,131 yr D. 832.5 yr
Determine either absolute convergence, conditional convergence or divergence for the series.
A. Converges conditionally B. Converges absolutely C. Diverges
Perform the indicated operation. Write the result in the form a + bi.(15i)(14i)
A. 0 + 210i B. 0 - 210i C. -210 + 0i D. 210 + 0i
Solve the given equation by finding the unknown value.5 ? ? = 90
A. 20 B. 19 C. 18 D. 21