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Posts tagged with app

Mathematician develops an app to reduce Jet Lag

April11

In his Research Statement, Mathematician Danny Forger says that he devotes his research to “understand biological clocks”…using “techniques from many fields, including computer simulation, detailed mathematical modeling and mathematical analysis, to understand biological timekeeping.” Perhaps this is why he has developed an app to reduce jet lag for travellers. “Overcoming jet lag is fundamentally a […]

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Triangles in Everyday Life

June3

We find triangles all around us – whether in construction, surveying, flight paths, bridge design or in fabric shapes and tiles. This picture shows a clever use of equilateral triangles on a building in Brisbane city. You can find 38 jobs that use congruent triangles here! Find out more about the properties of triangles with […]

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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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