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Posts tagged with tsunami

New Algorithm to predict Tsunamis


Scientists at the Australian National University have a plan to improve tsunami warning systems around the globe: they’ve built an algorithm. Using data from monitors in the ocean and modeling what a tsunami looked like when it was birthed, the team of researchers can better predict how big it is, where it’s going, and who’s […]

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Another Quake in Indonesia


  News today of another large earthquake off the Indonesian North West coast brought fear and panic to those living in low-lying areas. Fortunately, today’s earthquake was more of a horizontal movement than a vertical one – so only small tsunami of around 10cm resulted. H3 Maths has posted a few notes on the measurement of […]

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Tsunami Remembrance


We are still in awe at the destructive tsunami that hit Japan a year ago. This composite picture gives some idea of the power of the earthquake and the tsunami that followed. Our hearts go out to our Japanese friends for all the sadness they endured and still endure today: This tsunami was triggered by […]

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Post Support

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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