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 = 16 minutes.
A. - 
units/min
B. - 
units/min
C. - 
units/min
D. - 
units/min
Answer: D
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Solve the problem.A ball is thrown downward from a window in a tall building. The distance fallen after t seconds is 
where s is in feet. How long (to the nearest tenth) will it take the ball to fall 153 feet?
A. 3.1 sec B. 2.3 sec C. 5.3 sec D. 2.1 sec
Provide an appropriate response.Consider these two problems:(A) Solve this equation (x + 5)2 = 225. (B) Solve this equation (x + 5)2 = - 225.What is the answer to part (A) and (B) , and why are the answers to each part different?
What will be an ideal response?
Find the area of the shaded region in the figure. Round results to the nearest unit. Use ? ? 3.14.
A. 137 cm2 B. 55 cm C. 548 cm2 D. 55 cm2
Divide.
A. 0.00007428 B. 0.0007428 C. 0.07428 D. 7.428