## Welcome to H3 Maths

Blog Support for Growing Mathematicians

## Posts tagged with Christchurch

### 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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### Aftershocks and Probability

May20

My sister and her husband have just been visiting Christchurch, where a devastating earthquake destroyed much of the inner city and many lives were lost. Today, she was out of town when a force 4 quake hit the city, but she was back in town when another one struck. Then today we heard news of […]

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### Data Display – Migration after Christchurch Earthquakes

February23

The New Zealand Herald has surveyed the migration patterns following the severe earthquakes in Christchurch a year ago. The use of percentages, a pie graph and Migration Map with flow lines illustrates different data displays. Each has its strengths and weaknesses. Click on the map to read each migration story as this brings the data […]

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#### Post Support

10 x 9 x 8 + (7 + 6) x 5 x 4 x (3 + 2) x 1 = 2020

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)?]