Express in terms of i.- 
A. -4
i
B. -4
C. 4
D. 4
i
Answer: A
Mathematics
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Find the unit tangent vector of the given curve.r(t) = (cosh t)i + (sinh t)j + k
A. T(t) = - 
(tanh t sech t)i + 
j + 
(sech t)k
B. T(t) = - 
(tanh t)i + 
j + 
(sech t)k
C. T(t) = 
(tanh t sech t)i + 
j + 
(sech t)k
D. T(t) = 
i + 
j
Mathematics
Solve the compound linear inequality graphically. Write your answer in interval notation. 15 < -5b ? 35 
A. [-7, -3] B. [-7, -3) C. (3, 7] D. (-7, -3)
Mathematics
Solve the problem.If one earthquake is 100,000 times as intense as another, what is the difference in the Richter scale readings of the two earthquakes?
A. 5 B. 11.5 C. 4 D. 0.5
Mathematics
Add or subtract, as indicated. Assume that all variables represent positive real numbers.6
- 11
+ 2
A. -3
B. -7
C. 7
D. 3
Mathematics