Solve the problem.The concentration of a certain drug in the bloodstream t minutes after swallowing a pill containing the drug can be approximated using the equation 
where C(t) is the concentration in arbitrary units and t is in minutes. Find the rate of change of concentration with respect to time at t = 6 minutes.
A. - 
units/min
B. - 
units/min
C. - 
units/min
D. - 
units/min
Answer: A
Mathematics
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Evaluate the line integral along the curve C.
ds , C is the curve r(t) = (3t7 cos t)i + (3t7 sin t)j + 3t7k , 0 ? t ? 7
A. 343(4 - 
)
B. 686(4 - 
)
C. 686(4 + 
)
D. 0
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Find the exact value of the expression.sin 25° cos 35° + cos 25° sin 35°
A. 
B. 
C. 
D. 
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Convert the measurement as indicated.4 qt to cups
A. 16 c B. 1 c C. 32 c D. 64 c
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Complete the identity.1 - cos(2?) + cos(6?) - cos(8?) = ?
A. 4 sin ? sin(3?) sin(4?) B. 4 cos ? cos(3?) cos(4?) C. 4 cos ? cos(3?) sin(4?) D. 4 sin ? cos(3?) sin(4?)
Mathematics