Precalculus Practice Exam

Part 3 Test 3 Time: 1 hour


  1. Solve the following equation for x:

    displaymath73


    Answer: tex2html_wrap_inline90 tex2html_wrap_inline92 .

  2. The half-life of tex2html_wrap_inline100 Ra is 1,620 years. How long before the sample reduces to 67% of the original amount?


    Answer: It will take 936 years.

  3. Find the special parabola tex2html_wrap_inline102 that contains the points (3,26), (-2,21), and (1,6).


    Answer: The parameters of the parabola are a=3,b=-2,c=5, so the equation for the parabola is

    displaymath75


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Sun Jun 22 21:16:15 MDT 1997

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