## Welcome to H3 Maths

Blog Support for Growing Mathematicians

## Posts tagged with disasters

### New Algorithm to predict Tsunamis

May28

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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### Earthquake equations to help in disaster planning

April29

New Zealand scientists are surveying several hundred people about their experiences in the February 2011 earthquake which devastated many parts of Christchurch, in the South Island. “Teams of scientists will scour the quake-shattered eastern suburbs of Christchurch to gather vital information to improve earthquake hazard and risk assessments in New Zealand. Where owners or occupiers […]

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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)?]