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Yes, Lombard St follows a Sine Curve

February13

So, wise mathematician, let’s connect our view of Lombard St with a Sine Curve. We can do this using (on Mac computers, etc.) a free application called Grapher (go to applications–>utilities–>Grapher) or check out the apps for iPhone and iPad here, or use one of the free online graphing tools.¬†Anyway, when we combine the sine curve (which occurs in nature heaps of times, such as the way a river meanders when it reaches the floodplain) and overlay this curve with the aerial shape of Lombard St (from Google Maps) the result is very plain to see:
Here is a visual Maths question. Which letter (a,b,c,d,e) below best shows the location of the van in the larger picture of Lombard St? The van is the 4th vehicle from the top of the picture (marked X) in the post below.

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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)?]

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