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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 at risk. This is a big step beyond existing tsunami warning systems, because it uses the actual data to generate predictions, rather than scenarios for tsunami risk that scientists have previously calculated, says Jan Dettmer, a seismologist at the university. (read the full article here).

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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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