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Maths, Addmaths and Statistics: Post your doubts here!

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Good morning people - apologies for everything that transpired tommorow.
I was just infected by the gifsease.

I am happy to announce that now. I. am.
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still a part - get ready for more today. :)

mr-burns-excellent-o.gif
I also got infected
5656456.gif
 
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http://papers.xtremepapers.com/CIE/Cambridge International O Level/Mathematics D (Calculator Version) (4024)/4024_s13_qp_22.pdf
Question 4 (a)
The working given in the marking scheme is

(AF + 16) * 6 = 138

I mean even if this is a trapezium, don't we have to multiply it by 2 as there are 2 trapeziums?
***amd***
this question came in our mock exams ....
so the area of the trapezium = 1/2 *height * (sum of parallel sides )
so we multiply it by 2 and then get ... 6 * (af + 16 )
 
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http://papers.xtremepapers.com/CIE/Cambridge International O Level/Mathematics D (Calculator Version) (4024)/4024_s13_qp_22.pdf
Question 4 (a)
The working given in the marking scheme is

(AF + 16) * 6 = 138

I mean even if this is a trapezium, don't we have to multiply it by 2 as there are 2 trapeziums?
***amd***
there are two trapeziums making an area if 138.
area of 1 trapezium = 0.5 (AF + 16) * 6
area of whole fig. = 138 = 2 * 0.5 (AF + 16) * 6
[2 * 0.5 = 1)
so..
(AF + 16) * 6 = 138
 
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