Solve the problem.The concentration of a certain drug in the bloodstream x hours after being administered is approximately 
Use the differential to approximate the change in concentration as x changes from 1 to 1.45.
A. 0.43
B. 0.38
C. 0.25
D. 0.84
Answer: C
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Solve the problem.Let y(t) be the population of a species of plant that is being harvested, for t ? 0. Consider the harvesting model 
where h is the annual harvesting rate, y0 is the initial population of the species, and t is measured in years. If y0 = 2000, what harvesting rate should be used to maintain a constant population of y = 2000, for t ? 0?
A. h = 4 yr-1 B. h = 10 yr-1 C. h = 100 yr-1 D. h = 2000 yr-1
Find the slope of the tangent line to the given polar curve at the point specified by the value of a.
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Determine whether the Law of Sines or the Law of Cosines should be used to begin to solve the given triangle. Do not solve the triangle. 
A. Law of Cosines B. Law of Sines
Write the indicated term of the binomial expansion.(4x + 7)3; 3rd term
A. 1176x B. 588x C. 49 D. 336x2