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Math Help - Multiple choice questions

  1. #1
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    Post Multiple choice questions

    2. Find the amount accumulated after investing a principal P for t years at an interest rate r. (use r as a decimal-not a %)

    P=1,000 t=7 r=9% compounded annually (k=1)

    A) $1677.10
    B) $1992.56
    C) $828.04
    D) $1828.04




    3. Find the amount accumulated after investing a principal P for t years at an interest rate r. (use r as a decimal-not a %)

    P=840 t=5 r=1% compounded continuously

    A) $1025.98
    B) $124,667.05
    C) $1274.19
    D) $883.07




    4. Suppose the amount of a radioactive element remaining in a sample of 100 milligrams after x years can be described by A(x)=100e^-0.01123x. How much is remaining after 103 years? Round the answer to the nearest hundredth of a milligram.


    A) 115.67 mg
    B) 0.31 mg
    C) 31.45 mg
    D) 317.94 mg
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  2. #2
    Senior Member apcalculus's Avatar
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    Quote Originally Posted by cspan1986 View Post
    2. Find the amount accumulated after investing a principal P for t years at an interest rate r. (use r as a decimal-not a %)

    P=1,000 t=7 r=9% compounded annually (k=1)

    A) $1677.10
    B) $1992.56
    C) $828.04
    D) $1828.04




    3. Find the amount accumulated after investing a principal P for t years at an interest rate r. (use r as a decimal-not a %)

    P=840 t=5 r=1% compounded continuously

    A) $1025.98
    B) $124,667.05
    C) $1274.19
    D) $883.07




    4. Suppose the amount of a radioactive element remaining in a sample of 100 milligrams after x years can be described by A(x)=100e^-0.01123x. How much is remaining after 103 years? Round the answer to the nearest hundredth of a milligram.


    A) 115.67 mg
    B) 0.31 mg
    C) 31.45 mg
    D) 317.94 mg
    For 2 and 3 you should have some formula you can plug into.

    For 4, plug in x=103 to find the amount remaining.
    Good luck!
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