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    Question:

    Parts a and b I am fine with. As for part c:

    Working:

    T=18 when t=70, T=12 when t=120

    18-5=13=B*exp(-70*0.0124)
    B=13*exp(0.868)=30.9 (3 s.f.)

    Check with other values:
    12-5=7
    B=7*exp(1.488)=30.9 (3 s.f.)

    Markscheme:

    I may have the right final answer, but I can't see why you can't simply sub in values for T for corresponding t like I did above.
    Then again, it did seem like three too easy marks.
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    (Original post by Nuclear Ghost)
    Question:

    Parts a and b I am fine with. As for part c:

    Working:

    T=18 when t=70, T=12 when t=120

    18-5=13=B*exp(-70*0.0124)
    B=13*exp(0.868)=30.9 (3 s.f.)

    Check with other values:
    12-5=7
    B=7*exp(1.488)=30.9 (3 s.f.)

    Markscheme:

    I may have the right final answer, but I can't see why you can't simply sub in values for T for corresponding t like I did above.
    Then again, it did seem like three too easy marks.
    it works both ways
    ok even if not in the marking scheme
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    (Original post by TeeEm)
    it works both ways
    ok even if not in the marking scheme
    Thank you.
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    (Original post by Nuclear Ghost)
    Thank you.
    no worries
 
 
 
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