Solve the problem.The concentration of a drug in the bloodstream, measured in milligrams per liter, can be modeled by the function, 
where t is the number of minutes after injection of the drug. When will the drug be at its highest concentration? Approximate your answer rounded to two decimal places.
A. t = 3.65 minutes after the injection is given
B. at the time of injection
C. t = 0.55 minutes after the injection is given
D. t = 4 minutes after the injection is given
Answer: C
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Solve the problem.Find the point on the plane 
that is nearest the origin.
A. (4, 4, 0) B. (2, 4, -2) C. (2, 4, 0) D. (-2, 8, 2)
Find the equation that the given graph represents.
A. f(x) = -x3 - x - 4 B. f(x) = 2x4 - x2 + 4 C. f(x) = -x4 + x2 - 3x - 4 D. f(x) = 2x3 + x2 - 3x + 4
Rewrite the given expression without exponents.x2y3z2
A. x + x + y + y + y + z + z B. x + x + x + y + y + y + z + z C. x ? x ? x ? y ? y ? z ? z D. x ? x ? y ? y ? y ? z ? z
Solve the system of equations by the addition method.
A. (6, 2) B. no solution C. infinite number of solutions D. (2, 6)