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Posts tagged with Graphing

Graphing altitude, speed and time

April5

Aircraft have to fly the most efficient way in order to maximise profits for the airline. The take-off, cruising altitude and speed, and descent are all carefully calculated mathematically. There are many complex factors at work in flight dynamics. This example shows three related flight parameters (which we looked up as it was a flight […]

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Which is the best graph for the data?

March31

So, growing mathematicians, how would you best graph the data in the previous post? We have 867 for Australia and 57 for France. Can these be fitted easily onto a y-axis (vertically)? Is a column graph (with gaps) better than a histogram (with no gaps)? Or would you use a pie or line graph? As […]

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Iditarod Activity Sheet for Middle School

February28

I have included an activity sheet for Year 8 or 9 students to help them take a mathematical interest in the Iditarod Race, and also use Excel to sort and graph the mushers. Click on or download Using the Iditarod Race as a Teaching Tool in Mathematics.  

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Graph Interpretation

February17

Here is a challenge. Can you work out what information is being displayed in this graph? In a previous blog we talked about the fact that every graph tells a story. Of course, sometimes the story is not very clear or obvious but, as a mathematical sleuth, you can make some guesses! Click on the […]

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Misleading Graphics

January19

This graph (from The Australian) caught my eye today as summer temperatures soared in parts of Australia. Just a pity that there was not a Mathematician on hand to show the scale more accurately? You might be able to guess what the starting value is but, in essence, this is not good graphing from a […]

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What story is this graph telling?

June21

A great way to think about graphs is to ask students, “What story is this graph telling”. This is a better than saying, “Describe this graph information”, etc. So, what story do you think this graphic is telling about earthquakes in east and southern Australia?

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Really Easy Online Tool for making Pictograms

June5

Here is a cool little website for showing students how to create simple Pictograms (Pictographs – or, simply bar graphs with pictures). What I really like about it is that it allows students to use a picture to represent scale (e.g. 1 sheep in the graph = 100 in the data). It also allows sorting […]

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Post Support

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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