## Welcome to H3 Maths

Blog Support for Growing Mathematicians

## Posts tagged with Graphing

### Instant solutions at mathway.com

October17

Mathway boasts that it “provides students with the tools they need to understand and solve their math problems. With millions of users and billions of problems solved, Mathway is the #1 problem solving resource available for students, parents, and teachers.” What does H3 think? Yes, this is a useful problem-solving tool and the graphical functions […]

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### Buying a car with the help of Math

July9
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### Gold Increases by 300%!

February19

This gold chart (source: Kitco.com) appears to show a dramatic – over 300% – increase in the value of gold over a period of just 7 hours on February 15th, 2019.  Students learning Mathematics and Statistics must exercise their detective instincts when viewing data in graphical form and this is an excellent example. Of course, […]

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### How we construct bar graphs in New Zealand

March28
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### DESMOS – Your new best graphing friend!

May26

Desmos is a great online graphing tool and ideal for teaching and learning at all levels. It is intuitive and really versitile and highly recommended by H3 Maths as “Your new best graphing friend.” Give it a go!

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### Really (un)impressive data!

July11

There is was, plain to see – a staggering jump in the price of gold recently (from the Kitco website), and a graph to prove it! But wait, dear mathematicians, and hang onto your investment dollars! Use your mathematical sleuth skills to check this graph out a bit more carefully. Yes, the graph does show […]

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### Hmmm…

July7

Source: unknown (just as well?)

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### Math analyses car running costs for gas vs electric

June15

Let’s get the teenage emotion out of the way for a minute and look at the facts. Are electric (and hybrid) vehicles any cheaper to own over, say, a 60 month loan period? More info here!

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### Exponential Growth – the fish grow crazy

May27

If a population has a constant birth rate through time and is never limited by food or disease, it has what is known as exponential growth. With exponential growth the birth rate alone controls how fast (or slow) the population grows. Click this applet to see the effect:

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### More graphing

April12

How would you improve this graph? Can you see faults with the data? Are the conclusions correct?

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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)?]