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Codes and Ciphers


    Scientists announced yesterday that they have used computer translation techniques to decipher a 250 year old, coded manuscript written for a secret society. The manuscript, called The Copiale Cipher, is a beautifully-bound, 105-page, 18th century handwritten from Germany. To view this remarkable document and read of the secrets it unlocked (thanks to some […]

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NCEA Level 2 Algebra Problem. Using the information given, the shaded area = 9, that is:
y(y-8) = 9 –> y.y – 8y – 9 =0
–> (y-9)(y+1) = 0, therefore y = 9 (can’t have a distance of – 1 for the other solution for y)
Using the top and bottom of the rectangle,
x = (y-8)(y+2) = (9-8)(9+2) = 11
but, the left side = (x-4) = 11-4 = 7, but rhs = y+? = 9+?, which is greater than the value of the opp. side??
[I think that the left had side was a mistake and should have read (x+4)?]

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