## Welcome to H3 Maths

Blog Support for Growing Mathematicians

### 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 to life.

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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)?]