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Posts tagged with depth

The depths that Math goes to…

July7

First, a few basic mathematical facts about our oceans: …which made me think about the equation for water pressure at different depths. Pressure  increases by 1 atm with each 10 m of depth (at sea level the pressure is 1 atm). An “atm” is Atmospheric pressure, which is the force per unit area exerted against […]

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Depth (noun)…

December15

…a dimension taken through an object or body of material,usually downward from an upper surface, horizontally inward from an outer surface, or from top to bottom of something regarded as one of several layers. Depth has different meanings, depending on how tall you are!

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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)?]