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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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)
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)