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 = 0.55 minutes after the injection is given
B. t = 4 minutes after the injection is given
C. at the time of injection
D. t = 3.65 minutes after the injection is given
Answer: A
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Solve the problem.On a biology test, a student got 25 questions correct but did not pass. On a second attempt, the student got 31 questions correct. What was the percent of the increase?
A. 76% B. 24% C. 19.4% D. 6%
Solve.If the force acting on an object stays the same, then the acceleration of the object is inversely proportional to its mass. If an object with a mass of 28 kilograms accelerates at a rate of 
per second per second by a force, find the rate of acceleration of an object with a mass of 
that is pulled by the same force.
A. 35 meters per second per second
B. 
meters per second per second
C. 36 meters per second per second
D. 42 meters per second per second
The letters r and ? represent polar coordinates. Write the equation using rectangular coordinates (x, y).r = 2(sin ? - cos ?)
A. x2 + y2 = 2x - 2y B. 2x2 + 2y2 = y - x C. 2x2 + 2y2 = x - y D. x2 + y2 = 2y - 2x
Graph the function.f(x) = -2x(x + 1)(x + 2)
A. 
B. 
C. 
D. 