To understand the way to solve it, you have to doing an exercise from some of the question.
Question #1
![](http://mathematics.laerd.com/maths/img/question1.jpg)
Solution:
![](http://mathematics.laerd.com/maths/img/answer1.jpg)
Question #2
![](http://mathematics.laerd.com/maths/img/question2.jpg)
Solution:
![](http://mathematics.laerd.com/maths/img/answer2.jpg)
Question #3
![](http://mathematics.laerd.com/maths/img/question3.jpg)
Solution:
![](http://mathematics.laerd.com/maths/img/answer3.jpg)
Question #4
![](http://mathematics.laerd.com/maths/img/question4.jpg)
Solution:
![](http://mathematics.laerd.com/maths/img/answer4.jpg)
Now, you may try one of the questions above to know how it works..
GOOD LUCK!
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