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Posts tagged with conditional probability

Guilty or innocent? Math in the Courtroom Part II

April29

In 2003, a Dutch nurse named Lucia de Berk was accused of murdering several patients. She was sent to prison for six years in before her conviction was overturned in 2010. The reason for the overturning? The prosecutor and the judges behind the conviction could not do math correctly. The grade 11 class delved deep […]

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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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