The concentration x of a certain drug in an organ after t minutes is given by 
. Find the concentration of the drug at 20 minutes. Round your answer to four decimal places.
?
A. 0.0600
B. 0.0108
C. -0.0553
D. 0.0692
E. 0.8647
Answer: D
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Solve the problem.Find the image of the given figure under the translation that takes P to P'.
A. 
B. 
C. 
D. 
Solve the problem.Jane has invited 50 people to a party and expects 
to attend. Of those invited who attend, 
will bring a date. Express the expected number of guests n as an inequality and graph the values of n.
n = number of guests
A. 24 ? n ? 40
n = number of guests
B. 42 ? n ? 60
n = number of guests
C. 20 ? n ? 25
n = number of guests
D. 30 ? n ? 40
n = number of guests
Determine if the given polar coordinates represent the same point.(2, ?/4), (-2, -?/4)
A. Yes B. No
Calculate the flux of the field F across the closed plane curve C.F = y2i + x3j; the curve C is the closed counterclockwise path formed from the semicircle 
0 ? t ? ?, and the straight line segment from (-4, 0) to (4, 0)
A. - 32 B. 32 C. 0 D. 64