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Posts tagged with computing

Why do we need quantum computers?

February5
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Google at it again, Mathematically speaking…

December28

This just in from The Financial Review: “Ever since the 1980s, researchers have been working on the development of a quantum computer that would be exponentially more powerful than any of the digital computers that exist today. And now Google, in collaboration with NASA, says it has a quantum computer – the D-Wave 2X – […]

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One Apple 1 is very special

October23

At the calculating roots of our high school math courses was a rather crude looking computer called the Apple 1. Guess what? A model of the Apple-1 (above) recently sold for a stratospheric $US905,000 by Bonhams auction house! This was a working model of the Apple-1 and among the 50 models that were assembled by […]

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12kb of Memory and only weighs half a tonne!

October21

The world’s oldest computer has been rebooted by two dedicated engineers who have spent nine years bringing it back to life. The ICT1301 computer, known as a Flossie, measures 20ft by 22ft, and was originally used by London University to organise the grades of A and O-level exam results and print certificates. The computer has […]

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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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