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9.9 Using Second Derivatives

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Question 28

The concentration of a specific chemical dye in a test vat, $C$ (measured in mg/L), is modeled by the function

11\sqrt{t} + 10, \quad t > 0

where $t\,$ is the time in hours since the dye was introduced.

Determine the two values of $t\,$ for which the concentration is exactly 5 mg/L.

[4]

Find the value of $t\,$ for which $C′′(t)=1132\displaystyle C''(t) = \frac{11}{32}$ .

[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

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9.9 Using Second Derivatives

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Question 28

The concentration of a specific chemical dye in a test vat, $C$ (measured in mg/L), is modeled by the function

11\sqrt{t} + 10, \quad t > 0

where $t\,$ is the time in hours since the dye was introduced.

Determine the two values of $t\,$ for which the concentration is exactly 5 mg/L.

[4]

Find the value of $t\,$ for which $C′′(t)=1132\displaystyle C''(t) = \frac{11}{32}$ .

[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.