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100m Graph

August6

Bolt triumphs again in the 100m Olympic sprint, clocking an Olympic record 9.63s, – 0.05s outside his world record. Below is a graph of the 100m with extrapolation of expected times in the future. Click here for more analysis of the 100m.
Activity: how fast was Bolt’s 100m in kms/hr or miles/hr? Answer in the Post Support column!! Note: The fastest human footspeed on record is 44.72 km/h (27.79 mph), (average speed between the 60th and the 80th meter) by Usain Bolt.  Compared to other land animals, humans are exceptionally capable of endurance, but exceptionally incapable of great speed. For example, cheetahs can attain short bursts of speed well over 100 km/h (62 mph) (from: Wikipedia)

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The graph on the left (Coronavirus) is for a time period of 30 days, while the one on the right (SARS) is for 8 months! Very poor graphical comparison and hardly relevant, unless it is attempting to downplay the seriousness of the coronavirus?

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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