Math For Social Sciences. Practice Exam

  1. Use the elimination method to solve each of the following systems:
  2. Let tex2html_wrap_inline153 , tex2html_wrap_inline155 , tex2html_wrap_inline157 and tex2html_wrap_inline159 .
  3. Use the Gauss Jordan method to solve the following system:


    Answer: x=-1, y=1, and z=-2.

  4. Use the method of matrix inverses to solve the following system:


    Answer: x=1 and y=-1.

  5. A 45-year-old man puts $1,000 in a retirement account at the beginning of each quarter until he reaches the age of 60 and makes no further deposits. If the account pays 11% interest compounded quarterly, how much will be in the account when the man reaches age 60?

    Answer: The money in the account will be approximately $148,809.

  6. A speculator agrees to pay $15,999 for a parcel of land; this amount, with interest, will be paid over 4 yr, with semiannual payments, at an interest rate of 10% compounded semiannually. Find the amount of each payment.

    Answer: Each payment will be approximately $2475.39.


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Tue Aug 12 21:51:10 MDT 1997

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