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HELP! with this question


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#1 gary

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Posted 10 October 2004 - 10:34 AM

A rectangular flag is to have trimming attached along 3 of its sides. The length of the trimming is 240 centimetres.

If x centimetres is the length of the flag, show that the area of the flag, A square centimetres, is given by A(x) = 2x (120-x).

Also can anyone help with this fraction it has puzzled me because my final answer has came out weird:

9/1 x 1/81 - 2/1 x 1/9

#2 Infinite_Dreams

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Posted 10 October 2004 - 11:12 AM

Draw the diagram to show the trimming covering 2x and L.

Then:

Total length of trimming = 240 = 2x + L
2x + L = 240
L = 240 - 2x
L = 2(120 - x)

A(x) = LB (let L = 2(120 - x), and B = x)
A(x) = 2(120 - x)x
A(x) = 2x(120 - x)

I get -9/81 for the fraction.


#3 gary

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Posted 10 October 2004 - 12:34 PM

Thanks for the help. tongue.gif





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