Evaluate the expression.3-2
A. -9
B. 9
C. 
D. 
Answer: C
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Evaluate the integral.
A. cot ? - csc ? + C B. cot2 ? + csc ? + C C. csc2 ? - cot ? + C D. cot ? + csc ? + C
Rationalize the numerator of each fraction.
A. 
B. 
C. 
D. 
Find the vertex, focus, and directrix of the parabola. Graph the equation.x2 = 12y
A. vertex: (0, 0)
focus: (3, 0)
directrix: x = -3
B. vertex: (0, 0)
focus: (-3, 0)
directrix: x = 3
C. vertex: (0, 0)
focus: (0, 3)
directrix: y = -3
D. vertex: (0, 0)
focus: (0, -3)
directrix: y = 3
Solve the problem.The half-life of a certain radioactive substance is 20 years. Suppose that at time 
there are 30 g of the substance. Then after t years, the number of grams of the substance remaining will be N(t) = 30(1/2)t/20. How many grams of the substance will remain after 80 years?
A. 0.47 g B. 0.23 g C. 1.88 g D. 0.94 g