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9.9 Using Second Derivatives

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Question 21

The population of a luminescent algae colony, $P$ , measured in thousands, is modelled by the function

20\sqrt{t} + 25, \quad t > 0

where $t$ is the time in hours since the colony was first observed.

Determine the values of $t$ for which the population is exactly 9 thousand.

[3]

Find the value of $t$ for which $d2Pdt2=527\dfrac{d^2P}{dt^2} = \dfrac{5}{27}$ .

[4]

Markscheme

9.9 Using Second Derivatives Questions

A Level
Maths
9.9 Using Second Derivatives

57 exam-style questions on Edexcel A Level Maths 9.9 Using Second Derivatives. Each one has a worked solution and a mark scheme showing where the marks go.

9.9 Using Second Derivatives

Question bank

9.9 Using Second Derivatives

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Question 21

The population of a luminescent algae colony, $P$ , measured in thousands, is modelled by the function

20\sqrt{t} + 25, \quad t > 0

where $t$ is the time in hours since the colony was first observed.

Determine the values of $t$ for which the population is exactly 9 thousand.

[3]

Find the value of $t$ for which $d2Pdt2=527\dfrac{d^2P}{dt^2} = \dfrac{5}{27}$ .

[4]

Markscheme

9.9 Using Second Derivatives Questions

A Level
Maths
9.9 Using Second Derivatives

57 exam-style questions on Edexcel A Level Maths 9.9 Using Second Derivatives. Each one has a worked solution and a mark scheme showing where the marks go.