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Posts tagged with algorithms

The Math of Image Compression – PNG vs JPG

February13

JPEG Short for Joint Photographic Experts Group — the team that developed the format — JPEG has become the standard compressed format in digital photography and online image sharing due to its careful balance of file size and image quality. The exact ratio differs depending on the program and settings used, but the typical JPEG image […]

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Why math if we don’t use it in everyday life?

February9

That’s a very good question and I am going to invite Kedar Marathe – who works at Tata Technologies in India – to answer it: “Look around the world in which you live. Almost everything that you experience and enjoy is possible because of Mathematics. 1. You drive a car. A car company uses CAD […]

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Mathematics. Trust me. It’s important in your life

April27

Who uses calculus? You do. Every day. Dr Ron Sandland celebrates the International Year of the Mathematics of Planet Earth. The American writer Jodi Picoult (seen here) was invited to contribute to Dear Me, in which she wrote a letter to her younger 16-year old self. It contains some very warm and witty advice, but […]

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Putting a Face to Mathematics

April22

In less than a week H3 has had a retina scan for airport security plus a 15-point face scan for new drivers’ licences. How does this technology work and what role does Mathematics play in it? Face recognition is the process of identifying one or more people in images or videos. Algorithms for face recognition […]

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I’ve grown used to your (math) face!

December1

This article, in the Financial Review, looks (pun intended) at how mathematical algorithms (Al Gore related??) are used for facial recognition. Wow – scary stuff for growing mathematicians?

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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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