## Welcome to H3 Maths

Blog Support for Growing Mathematicians

### The Richter Scale … NOT!

February28

Time for some humour. Here is a different take on our earlier article about Logarithms and the Richter Scale. From the NZ Herald Sideswipe Column (click on image for link). Actually, being in an earthquake of any sort is very terrifying and nature has no way of letting you know when it’s all over! I was in a big shake in Oregon a few years ago. I was sitting at my desk in the School District admin building and thought that someone was shaking my chair…until I saw the lights overhead swaying beneath the concrete ceiling. My immediate reaction was just as this sign suggests…”I’m out of here!”

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#### Post Support

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)?]