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Archive for May, 2019

A day of remembrance …

May28

Memorial Day – a few statistics: Memorial Day in the USA marks the beginning of summer. Barbeques and parties dominate the holiday. Americans will consume 818 hot dogs every second from Memorial Day to Labor Day (seven billion in total), and spend $1.5 billion on meat and seafood over the weekend. More than forty-two million […]

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Did Einstein Really Flunk at Math?

May21

In this picture, taken in 1934, a rather nervous-looking Albert Einstein gives a lecture to the American Association for the Advancement of Science in Pittsburgh. But, rumour has it that he failed in his early math exams. Scientists announced in 2016 that they had detected gravitational waves from the merging of two black holes in […]

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Math to the Max

May11

How safe is the Boeing 737 MAX series? This emotive question requires us to do some mathematics. In its current implementation the 737 MAX is no safer than first generation jetliners flying in the late 1950s to early 1960s: types that included the Comet, Caravelle, BAC-111, Trident, VC-10, early 707, 720, DC-8 and Convair 880/890. […]

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The Good Chalk Talk on Mathematics

May6

Amazing that having the right chalk can make a mathematician work better and feel happier. After all, when has Mathematics been about ‘feeling’? Actually, it is ALL about feeling – about feeling confident, about feeling like taking risk, about feeling good when solving problems and feeling great at a mathematical revelation while sitting at the […]

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Measuring Ocean Waves – Wow!

May4

Waves in the Southern Ocean have already been recorded over 20 metres in height, but new research shows they’re getting higher. A small but significant increase of 1.5 metres per second – 8 per cent – was noted by researchers who analysed approximately 4 billion observations from 31 satellites and 80 ocean buoys worldwide. “Although increases of […]

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Radical Ratios

May2

Taking a person, when squatting, to be approx. a meter in diameter, we end up with the following ‘radical ratios’: 1. The size of a human cell to that person is the same ratio as a person’s size to Rhode Island 2. The size of a virus to a person is the same ratio as […]

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Post Support

Largest number between o and 1 million which does not contain the ‘n’ is 88

 

Rotation SAT Problem: Answer: 4 (see: https://www.youtube.com/watch?v=FUHkTs-Ipfg)

 

Which number has its letters in alphabetical order? Answer: F O R T Y

Hidden Rabbit? Clue: check the trees

How long for the stadium to fill? 45 minutes.

Where are you? the North Pole

Prize Object Puzzle: If Sue does not know where the prize is in the first question, it can’t be under the square. She must have been told it is under another shape. Apply this same logic to Colin. It is then obvious that the prize cannot be under a yellow object. That helps Sue eliminate her yellow shapes. Got the idea?

Algebra Puzzle: Answer = 1

Popular Math Problems Answers: 1, 1

Number of tabs? According to Lifehacker, the ideal number of tabs you should have open is nine. Yes, a single digit. To some, this is like playing a piano and only using a fraction of the notes!

Worst Graph? Where to start. What a visual mess and even some of the lines merge and are impossible to follow. A graph is a visual display of data, with the goal to identify trends or patterns. This is a spider’s web of information which fails to show a clear pattern at all. Solution? Well, different colors would help, or why not group in two or three graphs where trends are similar?

Number of different nets to make a cube is eleven – see this link

Homework Puzzle; The total value of the counters is 486, so halve this to get 243. Now, arrange the counters to equal this amount twice.

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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