56 Items Sort by Title Date Type
• ### 150 years of potato production

The humble potato has been a staple crop for many years. This note provides a brief overview of potato production in Australia for the period 1861 - 2011.

99 KB • PDF File • 25 April 2016

• ### 2016 HSC Ext 1 Maths Q14c

The last question in this year's HSC Extension 1 Mathematics exam asked students to locate the point on a given parabola that minimised the distance to a related point on another parabola. Students were told that the lines perpendicular to the tangents at the two points coincided. The plot on the left shows lines that do not coincide and therefore the distance is not minimised. However the plot on the right shows that the correct point has been located and the distance minimised. The full analysis is on my website.

112 KB • PDF File • 4 November 2016

• ### 2018 Extension 2

Solutions to Q16 of the 2018 Extension 2 exam.

547 KB • PDF File • 6 November 2018

• ### A cubic inequality

Proof of a cubic inequality that is often set in maths competitions.

54 KB • PDF File • 31 March 2020

• ### A four colour problem

The solution to the last question of the 2020 Australian Mathematics Challenge for Years 7 and 8.

69 KB • PDF File • 8 December 2020

• ### A number puzzle

A number puzzle can require you to find the numbers in circles that add to numbers on connecting lines. This note shows how to do this easily.

111 KB • PDF File • 13 April 2019

• ### Algebra preparation for Year 11

Schedule of 20 sessions covering all the algebra required to enter Year 11. The page numbers are shown for the references used.

117 KB • PDF File • 29 June 2018

• ### An Application of Differential Equations

An application of a differential equation to a mixing problem, showing the solution that cannot be obtained by separation of variables.

79 KB • PDF File • 24 September 2021

• ### Arc length using the inverse function

An example of an integral used to evaluate arc length. The integral cannot be evaluated numerically so the inverse function is used. An alternative substitution is also adopted.

104 KB • PDF File • 27 June 2017

• ### Aspects of the Poisson probability function

The Poisson probability function models discrete (count) data. This note looks at a linear transformation of the standard probability function and also derives the conditional probability of the number of outcomes of one Poisson random variable given the total number of outcomes of two independent Poisson random variables.

129 KB • PDF File • 21 July 2015

• ### Attractors, bifurcations and chaos

This note looks at how some mathematical relationships that can be simply stated produce vastly different results when a parameter value is altered.

1.8 MB • PDF File • 5 January 2015

• ### Bases in n-dimensional space

Here is an article in linear algebra - how to calculate the transition matrix and use it to obtain coordinates with non-standard bases.

126 KB • PDF File • 21 January 2021

• ### Blood Alcohol Concentration Formula

Some comments on the formula for Blood Alcohol Concentration (BAC) used in General Maths.

83 KB • PDF File • 10 July 2014

• ### Complex Modulus Locus Problem

This note looks at the locus of the modulus of a function of complex numbers. The locus has some interesting properties. Increasing a parameter draws two identical entities together; after they touch they join and also give up a part of themselves to produce an offspring.

160 KB • PDF File • 15 December 2016

• ### Curves

Plots of some interesting families of curves not normally encountered.

590 KB • PDF File • 18 December 2014

• ### December 2020 problems with solutions

My solutions to the two problems given in December 2020

250 KB • PDF File • 18 December 2020

• ### Derivation of Simpson's Rule

Ever wondered why the multiples (1,4,1) are used in Simpson's Rule? This article shows one method for obtaining these multiples.

308 KB • PDF File • 30 January 2015

• ### Deriving formulae for sum and term of series

This notes derives the formula for the term given the sum and the sum given the term for a specific family of series.

70 KB • PDF File • 6 January 2018

• ### Distances and complex roots of unity

Formulae for calculating functions of distances between points and complex roots of unity. One formula for a point on the unit circle and another for a point on the real axis.

311 KB • PDF File • 3 December 2018

• ### Finding an inflection point for a rational function

The standard method of finding the inflection point for a rational function with quadratic numerator and denominator can involve a fair bit of algebra and solving a difficult cubic equation. An alternative method using partial fractions makes the job a lot easier. This note works through such an example.

114 KB • PDF File • 14 April 2020

• ### Force to lift wheel over step

This note shows how to calculate the force required to lift a wheel up and over a step.

61 KB • PDF File • 21 November 2018

• ### Fourier Series Example

Derivation of the Fourier Series for a piecewise function.

110 KB • PDF File • 18 July 2017

• ### HSC Revision Questions - Extension 1 - Set 1

65 KB • PDF File • 10 April 2014

• ### HSC Revision Questions - Extension 1 - Set 2

63 KB • PDF File • 10 April 2014

• ### HSC Revision Questions - Extension 1 - Set 3

More Extension 1 questions for revision

87 KB • PDF File • 18 June 2014

• ### HSC Revision Questions - Extension 2 - Set 1

58 KB • PDF File • 10 April 2014

• ### HSC Revision Questions - Extension 2 - Set 2

69 KB • PDF File • 10 April 2014

• ### HSC Revision Questions - Mathematics

Revision questions for Mathematics

64 KB • PDF File • 10 April 2014

• ### Inflection point location

This note look at the location of inflection points relative to stationary points.

121 KB • PDF File • 6 December 2014

• ### Integers expressed as difference of two squares

This note shows which integers can be expressed as the difference of two squares.

115 KB • PDF File • 21 November 2014

• ### Integration of some relatively simple functions

Even relatively simple functions are not simple to integrate as shown in these examples. The results are commonly available in a Table of Integrals.

92 KB • PDF File • 6 August 2015

• ### Interactive Limacon

An app to illustrate the limacon curve. The parametric coordinates are given by x = 2cos(t) - h cos(2t), y = 2sin(t) - h sin(2t). This app uses two arms with variable lengths a and b to control the shape of the curve, taking the place of the parameter h, and t to control the angle of rotation. See what happens when these variables are altered, either using the arrow buttons or inputting a value yourself.

87 KB • HTML Document • 29 April 2016

• ### Interactive Rose Curve

A diverse family of curves are the rose curves. The parametric coordinates are x = 2b cos(t) cos(nt), y = 2b sin(t) cos(nt). Here b controls the radius of the figure and n controls the frequency. Changing n by a small amount (0.1 for example) gives a vastly different image. Increment n by 0.01 manually and watch what happens.

79 KB • HTML Document • 29 April 2016

• ### Interactive Trochoids

A trochoid is a curve formed when one circle rolls around another circle, either inside (hypo-) or outside (epi-). When the point describing the curve lies on the circumference of the moving circle we have hypocycloids and epicycloids. The parametric coordinates are ((a+1)cos(t) - cos(a+1)t, (a+1)sin(t) - sin(a+1)t). The interactive app shows the resulting curves for (-5

80 KB • HTML Document • 9 May 2016

• ### Matrix exponential solves system of DEs

This note shows how the matrix exponential is used to solve a simple system of differential equations.

79 KB • PDF File • 6 January 2018

• ### Means

This note looks at three types of Means - Arithmetic, Geometric and Harmonic - and the situations where they are appropriate.

154 KB • PDF File • 28 January 2015

• ### Modular arithmetic

Modular arithmetic looks at relationships between numbers through the remainders when divided by the same integer. Powers of integers produce patterns in the remainders and these patterns can be used to solve problems.

124 KB • PDF File • 17 April 2020

• ### Most used letters in the English language

This note looks at the distribution of letters in the English language as well as how the distribution can change significantly when a cipher is used.

162 KB • PDF File • 5 December 2020

• ### Novel recruitment method

Google used a novel method to find potential employees

95 KB • PDF File • 22 September 2014

• ### Phase portraits for systems of DEs

Given a system of differential equations with two variables we can plot the gradient in 2D. A critical point, where the gradient is zero, can be classified as a centre, a spiral, a node or a saddlepoint, depending upon the values of the eigenvalues of the coefficient matrix. This note illustrates all possible types of points for a linear system. Also shown is an example of the predator-prey model.

716 KB • PDF File • 6 January 2018

• ### Product and Quotient Rules

A logical way to express the Product and Quotient Rules for differentiation.

60 KB • PDF File • 9 February 2013

• ### Questions to ponder

Six questions to extend your mathematical knowledge and understanding

32 KB • PDF File • 13 December 2012

• ### Revision for Year 11 Mathematics

A set of 10 revision questions for Term 1 of Year 11. Other sets of questions are available only to students attending Kenderdine Maths Tutoring.

59 KB • PDF File • 22 May 2014

• ### Scaling of the 2019 HSC Mathematics exams

A common statement made by students is 'Standard Mathe will give you a higher ATAR than Advanced Maths' This note makes some observations regarding the difference between the HSC and Scaled marks for Standard Mathematics compared to Mathematics in the 2019 HSC.

364 KB • PDF File • 9 April 2020

• ### Slope fields for First-order Differential Equations

This note gives one example of the construction and interpretation of a slope field for a first-order differential equation. The complete document with 14 examples is available to students of Kenderdine Maths Tutoring.

189 KB • PDF File • 13 July 2020

• ### Solutions to 6 questions

Solutions to 6 questions of Dec 13

240 KB • PDF File • 7 March 2013

• ### Sum a sequence of 1s and 2s

How to calculate the sum of the sequence 1,2,1,2,2,1,2,2,2,1,2,2,2,2,......

102 KB • PDF File • 23 November 2018

• ### Sums of powers of natural numbers

How are formula derived for the sums of powers of the natural numbers? Archimedes was able to sum the square numbers but it wasn't until 1713 that Bernoulli published a method for summing other powers.

210 KB • PDF File • 12 December 2014

• ### Tangential circles solution

Solution to the tangential circles problem

57 KB • PDF File • 31 January 2013

• ### Tangential circles

Finding the radius of a tangential circle.

16 KB • PDF File • 23 January 2013

• ### Triangular pattern of the numbers 1 to 6

This note gives the possible patterns when the numbers 1 to 6 are arranged in a triangular pattern with constant sum along each edge.

68 KB • PDF File • 21 November 2018

• ### Trigonometry - angles of any magnitude

Video showing how angles of any magnitude are related to acute angles and how to determine the appropriate sign of the trigonometric functions.

4.1 MB • Flash File • 19 July 2013

• ### Two standard integrals

A note on two similar standard integrals that appear to be unrelated but more advanced maths than HSC level shows them to be related.

111 KB • PDF File • 27 May 2016

• ### Viewing swf videos

Links to software and apps to view swf videos on your computer or smart phone

26 KB • Microsoft Word • 19 July 2013

• ### Why is 0!=1?

School students are told that 0! equal 1 without knowing why. This note explains why

119 KB • PDF File • 9 April 2018

• ### z scores

Video illustrating z scores

3.9 MB • Flash File • 29 June 2013

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