2019 ONE(b)

Achievement
Question
Find the rate of change of the function f(t)=5ln(3t1)f(t) = 5\ln(3t - 1) when t=4t = 4.

*You must use calculus and show any derivatives that you need to find when solving this problem.*
Official Answer
f(t)=153t1f'(t)=\frac{15}{3t-1}

f(4)=1511f'(4)=\frac{15}{11} or 1.361.36
Grading Criteria

Achievement (u)

  • Correct solution with correct derivative.

Merit (r)

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Excellence T1

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Excellence T2

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Video Explanation
NCEA Level 3 Calculus Differentiation 2019 NZQA Exam - Worked Answers by infinityplusone(starts at 2:04)
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