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**[Solved]This integral of k dt needed to get this mark-M1?**

## Homework Statement

Hi.The material,the question and the marking scheme respectively for my pure maths paper 3 question x1 only is shown below,it's an A2-level Oct 2002 paper if u know what that is.

Is the integral circled in red needed to integrate?I find I don't need it.Am I wrong,if so why?

## Homework Equations

Simple integration rules only.

## The Attempt at a Solution

I did attempt by doing :

Integral of dt/da = integral of (.1 a^-1 + .1(10-a)^-1)

= .1 ln(a/(10-a))

Ps- there, I did it without the integral circled in red.

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