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Mathematician develops an app to reduce Jet Lag


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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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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