HP 39/40 Math Applications The first size listed is the downloaded file size and the second size listed is the size on the calculator.

There are 111 files totaling 2801KB in this category.

 1-Var Inequalities   (details) 39/40 ENG   11KB/2KB Solve inequalities using a number line. By Hewlett-Packard. 2000/09/09

 2x2 Systems   (details) 39/40 ENG   17KB/1KB Solve 2X2 systems of linear equations using substitution, linear combination, and Cramer's Rule. By Hewlett-Packard. 2000/09/09

 ABC-Formula 1.0   (details) 39/40   35KB/3KB This is a Dutch program that solves the 'ABC Formule'. It's made in HP-Basic and is designed especially for HP-40G users. By Michaël De Coninck. 2003/07/01

 Active Grapher   (details) 39/40 ENG   14KB/4KB Investigate rigid transformations of seven basic functions: y=x, y=x^2, y=x^3, y=|x|, y=x, y=1/x, and y=1/x^2. By Hewlett-Packard. 2000/09/09

 Amplitude / Period   (details) 39/40 ENG   16KB/2KB Investigate the parameters A and B to see how they effect the functions y = Asin(Bx), y = Acos(Bx), y = Atan(Bx), y = Asec(Bx), y = Acsc(Bx), y = Acot(Bx). By Hewlett-Packard. 2000/09/09

 Angles   (details) 39/40 ENG   15KB/2KB Solve for the missing angle given a pair of complementary angles, a pair of supplementary angles, or a triangle. By Hewlett-Packard. 2000/09/09

 Archimedes   (details) 39/40 ENG   12KB/2KB Explore Archimedes' method for approximating the value of pi by comparing the area of a regular polygon to the area of the corresponding circumscribed circle. By Hewlett-Packard. 2000/09/09

 Area Model   (details) 39/40 ENG   13KB/2KB Multiply first degree monomials and binomials. By Hewlett-Packard. 2000/09/09

 Basic Functions   (details) 39/40 ENG   13KB/3KB Explore stretches, shrinks, and translations of seven basic graphs. By Hewlett-Packard. 2000/09/09

 Bivariate Oddities   (details) 39/40 ENG   12KB/3KB This aplet contains sets of bivariate data which have the same summary statistics but totally different 'shapes' when graphed. They illustrate the need to rely on more than just the stats when deciding on whether a linear model is appropriate! By Colin Croft. 2003/05/20

 Calculo de Superficies en 2D y 3D 3.02   (details) 39/40 ESP   16KB/40KB The program performs calculations of angles, distances, area and volumes of any figure. It can draw figures and keeps the points for possible modifications or calculations. By Fernando Pardo. 2004/10/31

 Cars 1993   (details) 39/40 ENG   58KB/2KB Explore relationships among the different data to investigate different cars, the cost, mpg, etc By Hewlett-Packard. 2000/09/09

 Central Limits Theorem   (details) 39/40 ENG   41KB/2KB One of the most fundamental theorems in the study of statistical inference is the Central Limits Theorem. This states basically that the means of successive random samples taken from a population will be normally distributed whatever the underlying parent distribution. This aplet illustrates this and that the standard deviations are related by ratio. Sampling can be done from different parent distributions and the resulting collection of means compared to the equivalent Normal distribution. It is fairly slow to execute because of the need for repeated sampling but would be quite useful to teachers. By Colin Croft. 2003/05/20

 Chain Rule   (details) 39/40 ENG   28KB/2KB Supplied along with a worksheet, this aplet encourages the student to deduce the Chain Rule for themselves via a series of pre-loaded examples. By Colin Croft. 2003/05/19

 Chi39 0.8   (details) 39/40 ENG   1KB/1KB Chi39 adds chi^2 functionality to the 39/40. Implemented are goodness of fit and two-way tables. By Tim Wessman. 2001/05/18

 Chords   (details) 39/40 ENG   16KB/4KB This aplet uses chords of diminishing lengths to find the limiting gradient at a point. A worksheet leads the student into discovering differentiation. (Used to be called 'A Different Slant'). By Colin Croft. 2003/05/19

 Christmas Trees   (details) 39/40 ENG   12KB/2KB School activity for investigating some interesting graphs which create Christmas tree style plots. By Colin Croft. 2003/05/19

 Coin Toss   (details) 39/40 ENG   30KB/1KB This aplet investigates the common charity game consisting of tossing of a coin onto a square grid. It requires only knowledge of quadratic functions and can be used at a number of levels: to illustrate the convergence of experimental values towards theoretical ones, to investigate fitting a quadratic curve to experimental data, and to introduce the idea of a probability function. By Colin Croft. 2003/05/20

 Collisions   (details) 39/40 ENG   16KB/2KB This aplet takes a vector problem involving two objects having an initial position and velocity and analyzes it as 'closest approach' style problem. A test tool rather than a teaching tool. By Colin Croft. 2003/05/20

 Complex Roots   (details) 39/40 ENG   9KB/1KB School activity to find the nth roots of any complex number and see them graphed on the Argand Plane. By Andy Vella. 2003/05/20

 Conic Plotter   (details) 39/40 ENG   26KB/2KB Investigate the conic sections in general and in standard form. By Hewlett-Packard. 2000/09/09

 Conics - Polar Form   (details) 39/40 ENG   19KB/1KB Investigate the polar form of the graphs of the conics to discover how changing the eccentricity and distance from the focus to the directrix effects the graph of the conic. By Hewlett-Packard. 2000/09/09

 Coordinate Geometry   (details) 39/40 ENG   17KB/3KB Find the midpoint, distance, and slope of a given line segment. By Hewlett-Packard. 2000/09/09

 Correlation   (details) 39/40 ENG   41KB/2KB Allows you to find the correlation and line of best fit from summary statistics. By David Kranz. 2003/05/20

 Curve Area   (details) 39/40 ENG   37KB/2KB Uses upper and lower rectangles to find the areas under supplied curves. A worksheet then takes the student through the process of deducing the rules of integration. By Colin Croft. 2003/05/20

 Dandelions   (details) 39/40 ENG   14KB/2KB This aplet uses visual methods to illustrate and introduce the Poisson distribution, through the sowing of dandelion seeds into a large patch of ground, which is then broken up into unit squares. By Colin Croft. 2003/05/20

 Decimals   (details) 39/40 ENG   14KB/1KB Explore patterns and symmetry by ordering pairs of digits from the decimal expansion of certain fractions that have periodic decimals. By Hewlett-Packard. 2000/09/09

 DFind/DSolve   (details) 39/40 ENG   190KB/2KB This paired set of aplets, based around the Function and Solve aplets, allow the user to quickly and easily find the features of functions such as intercepts and extrema using derivatives, automatically finding the derivative functions as part of the process. Obviously this is something which can already be done with the Function aplet but these two aplets automate the process by switching automatically between the abilities of the Function and Solve aplets. As an examination tool it is definitely worth having. By Matt Grosvenor. 2003/05/20

 Distance 1.0   (details) 39/40 ENG   1KB/1KB Find the distance between two points on in a coordinate graph. By Alex Seifert. 2002/03/09

 DoEasy Horner-Algorithm 1.0   (details) 39/40 ENG DEU   56KB/5KB This DoEasy-program shows you the Horner-Calculation of polynomial function-values. In case of f(x)=0 the program displays the factorized polynomial-function of the entered function. It's easier than it sounds like. View additional help for more information. By Florian Jurow. 2003/02/11

 Dot to Dot   (details) 39/40 ENG   13KB/1KB Explore points, slopes and equations of lines that enclose the figures. It is also possible for the student to investigate the piecewise functions that would create the exact drawing. By Hewlett-Packard. 2000/09/09

 Drill Core   (details) 39/40 ENG   44KB/2KB Explore relationships among the different data to predict the percent of iron in a given sample. By Hewlett-Packard. 2000/09/09

 Escalas 1.0   (details) 39/40 ESP   1KB/5KB Calculates the scales of a drawing. By Fernando Pardo. 2003/05/19

 F. Exponencial 1.0   (details) 39/40 ESP   22KB/2KB Allows one to study the behavior of exponential function Y=X. By José Andrés Jiménez. 2006/11/24

 F. Logarítmicas 1.0   (details) 39/40 ESP   32KB/5KB Allows one to study the behavior of logarithms in different bases with respect to the decimal logarithm. By José Andrés Jiménez. 2006/11/24

 F.Propor.Inv 1.0   (details) 39/40 ESP   36KB/5KB Allows one to study the behavior of the inverse function. By José Andrés Jiménez. 2006/11/24

 F'(x) 1.0   (details) 39/40 ENG   3KB/7KB This program has four parts. One finds the F'(x), another graphs it, another finds it for values of x, and the last tells you what the current equation is so you don't have to enter it again. By Geek Boi. 2003/05/07

 Factoring   (details) 39/40 ENG   16KB/2KB Symbolically factor second degree polynomials in the form Ax^2+Bx+C. By Hewlett-Packard. 2000/09/09

 Factorización   (details) 39/40 ESP   33KB/5KB Performs the factor decomposition of a polynomial using Ruffini's rule. By José Andrés Jiménez. 2006/11/24

 Fibonacci   (details) 39/40 ENG   20KB/2KB Determine an approximation for the golden mean using the ratio of width to length of the sides of the golden rectangles. By Hewlett-Packard. 2000/09/09

 Financial App 1.0   (details) 39/40 ENG   25KB/2KB This is a small financial program (it's only 1.4kb). You enter the principle, rate and time and the program returns the monthly payment, total amount that is paid and the total interest. By Michaël De Coninck. 2003/06/22

 Financiële Bibliotheek 0.1 Alpha   (details) 39/40   46KB/1KB This library will add the built-in financial functions from the TI-83(+) to the HP-39/40g. This is only a Dutch version and this library is not finished yet! There is still lot to be done! By Michaël De Coninck. 2003/05/19

 FisherZTransform 1.0   (details) 39/40 ENG   37KB/2KB Performs Fisher Z Transform test about RHO (coefficient of correlation) on the 39G and 40G. By Fabio Frascati. 2005/05/30

 Function Plus   (details) 39/40 ENG   7KB/1KB This is a copy of the Function aplet with an extra entry on the VIEWS menu which produces 'nice' scales. You may have noticed that the default plot view scale of -6.5 to 6.5 produces 'nice' step sizes of 0.1 when using the trace facility. This aplet will allow you to set whatever scale you choose and then correct it to the closest approximation which will still offer similar 'nice' trace values such as 0.2, 0.25, 2, 0.04 etc. It includes the ability to produce scales which are 'nice' fractions of pi for use with trig functions. By Colin Croft. 2003/05/20

 Gauss Jordan Operations   (details) 39/40 ENG   19KB/3KB Allows the user to perform the Gauss Jordan algorithm on a matrix using full row pivoting. By Roso Giuseppe (Beppe). 2003/05/20

 GP Solver   (details) 39/40 ENG   1KB/1KB Simply a copy of the Solve aplet with the relevant equations for geometric progressions pre-loaded. You can set it up easily yourself if you want to. By Colin Croft. 2003/05/20

 Grouped Data   (details) 39/40 ENG   18KB/5KB This aplet calculates and displays measures of central tendency and spread for data which has been grouped into intervals. The user puts the interval mid-points into C1, the frequencies into C2 and the aplet will display the mean, proportional median, lower and upper quartiles and various other values. The user can also perform calculations such as finding the values which cut off the top 15% of data, the middle 30% etc. By Colin Croft. 2003/05/20

 Guess Rational   (details) 39/40 ENG   14KB/4KB Write the equation of a rational function given horizontal and vertical asymptotes and a root. By Hewlett-Packard. 2000/09/09

 Guess the Line   (details) 39/40 ENG   14KB/2KB Write the equation of a line in slope-intercept form when given two points. By Hewlett-Packard. 2000/09/09

 Hexadecimal Calculator 1.2   (details) 39/40 ENG   125KB/9KB This is a lite version of the library originally developed by Martin Lang, includeing a hexadecimal and a binary calculator, two percentage functions and an alpha lock utility. Written in System RPL. By Martin A. Lang and Alessandro Strano. 2014/11/08

 Indices Practice   (details) 39/40 ENG   15KB/1+KB This aplet provides simple drill practice for students learning the laws of indices, with the option of including negative powers. It presents students with practice problems in correct mathematical layout and then allows them to enter the simplified answer. There are a wide variety of styles of problems. It will then tell them if they are right or wrong, offering a second chance if needed. By Colin Croft. 2003/05/20

 Inequations   (details) 39/40 ENG   11KB/2KB This is a copy of the function aplet with the additional ability to graph inequalities (linear/non-linear) for F1, F2 and F3(X). These can be overlaid to show intersections or unions. By Colin Croft. 2003/05/20

 Inverse 1.0   (details) 39/40 ITA   70KB/1KB Calculates quantiles of Normal, Chi-square, Fisher and student distributions. By Fabio Frascati. 2005/01/30

 Inverses   (details) 39/40 ENG   18KB/3KB Explore inverse relations and functions. Analyze relations and functions graphically, numerically, and symbolically. By Hewlett-Packard. 2000/09/09

 Key Finder   (details) 39/40 ENG   13KB/2KB This aplet uses a statistical model to simulate a person trying to find one particular key of six in their pocket. A investigation into the average run length when throwing dice. By Colin Croft. 2003/05/20

 Law of Sines   (details) 39/40 ENG   16KB/3KB Solve oblique triangles by applying the laws of sines. By Hewlett-Packard. 2000/09/09

 Laws of Exponents   (details) 39/40 ENG   13KB/2KB Apply the laws of exponents to multiply and divide monomials and to raise a monomial to a power. By Hewlett-Packard. 2000/09/09

 Linear   (details) 39/40 ENG   27KB/3KB Identify the slope and the y-intercept given a linear equation, and will describe the various effects positive, negative and zero values have on the graph. By Hewlett-Packard. 2000/09/09

 Linear Explorer   (details) 39/40 ENG   18KB/1KB An aplet similar to the Quadratic and Trig Explorers (but not as fast) which allows the student to explore linear graphs. The equation of the graph is displayed at the top left corner of the screen and the student can change the gradient and y-intercept using the arrow keys. Intercepts are shown on the screen. By Colin Croft. 2003/05/20

 Linear Fit   (details) 39/40 ENG   23KB/3KB The student nominates what they think is the line of best fit for a set of bivariate data. They can then adjust the line interactively, seeing the effect on the sum of squares of residuals. By Colin Croft. 2003/05/20

 Linear Inequality   (details) 39/40 ENG   15KB/3KB Graphically solve a linear inequality. By Hewlett-Packard. 2000/09/09

 Linear Programming   (details) 39/40 ENG   32KB/6KB This aplet visually solves linear programming problems, finding the vertices of the feasible region and the max/min of an objective function. The final stage of finding the vertices is a bit slow but the result is very impressive. It's a wonderful tool for teachers marking test papers - it lets you easily check whether a student's feasible region is correct if they have their constraints wrong. That's why I orginally wrote it: sheer frustration after the 20th paper that had to be reworked from scratch to assign part marks. By Colin Croft. 2003/05/20

 Matrix 0.9   (details) 39/40   22KB/18KB An applet to simplify several basic matrix operations. This version only is in Dutch. By David Biot. 2002/03/16

 Midpoint 1.0   (details) 39/40 ENG   1KB/2KB Solve for the midpoint on a line or a coordinate graph. By Alex Seifert. 2002/03/09

 Minimos Cuadrados 1.0   (details) 39/40 ESP   2KB/9KB Calculates the minima of a square by two methods (graphically and algebraically). By Fernando Pardo. 2003/05/19

 Newton-Raphson Iteration   (details) 39/40 ENG   14KB/2KB School activity designed to investigate the visual representation of the iterative process, and the effects on the iterative process of choosing "unstable" initial values. By Colin Croft. 2003/05/20

 NumTheory39   (details) 39/40 DEU   20KB/3KB Group of number theory programs for modulo powering, prime testing and factorizing of integers. Includes Rabin-Miller test and Shanks square form factorization. Full documentation in German. By Gerald Hillier. 2003/06/30

 Order of Operations   (details) 39/40 ENG   13KB/1KB Simplify expressions using the order of operations. By Hewlett-Packard. 2000/09/09

 Parallel / Perpendicular   (details) 39/40 ENG   16KB/4KB Write the equation of a line parallel or perpendicular to a given line through a given point. By Hewlett-Packard. 2000/09/09

 Percent   (details) 39/40 ENG   15KB/2KB Write ratios that will solve problems of the form A is B% of C. By Hewlett-Packard. 2000/09/09

 Periodic   (details) 39/40 ENG   40KB/3KB Explore the four different parameters that effect the graph of y=Asin(BX+C)+D and/or y=Acos(BX+C)+D, and will be able to analyze these symbolically and graphically. By Hewlett-Packard. 2000/09/09

 Phase Shift   (details) 39/40 ENG   15KB/4KB Investigate the parameter C to see how it effects the functions y = sin(x+C), y = cos(x+C), y = tan(x+C), y = sec(x+C), y = csc(x+C), y = cot(x+C). By Hewlett-Packard. 2000/09/09

 Point Guess   (details) 39/40 ENG   13KB/2KB Recognize and name the coordinates of points. By Hewlett-Packard. 2000/09/09

 Polar Equation Plot   (details) 39/40 ENG   16KB/3KB Graph polar equations and be able to analyze these symbolically and graphically. By Hewlett-Packard. 2000/09/09

 Polinomios 1.0   (details) 39/40 ESP   1KB/3KB Calculates roots and values of polynomials. By Fernando Pardo. 2003/05/19

 PolyMulti 1.0   (details) 39/40 ENG ITA   3KB/3KB This program multiplies two polynomials, given the number of coefficents in each one of them. Might work with complex numbers. By Pavel Poutchkarev. 2001/03/18

 Probability Distributions   (details) 39/40 ENG   22KB/2KB An essential tool for any student going into an exam which involves probability functions. This is two copies of the Solve aplet with equations pre-entered for Discrete and Continuous probability density functions respectively. Covers the Binomial distribution (individual and cumulative), the Poisson distribution (individual and cumulative), the Exponential function, the Normal distribution, plus more. By Colin Croft. 2003/05/20

 QPrograms   (details) 39/40 ENG   16KB/2KB This is an aplet which lets you perform a number of small tasks - calculate coefficients for binomial expansions, calculate mean and standard deviation of grouped data and divide complex numbers. By Matt Grosvenor. 2003/05/20

 QuadForm   (details) 39/40 ENG   17KB/2KB Determine the nature of the roots, predict how many times, if any, the graph of a parabola will cross the x-axis, and find the solution(s). By Hewlett-Packard. 2000/09/09

 Quadratic   (details) 39/40 ENG   22KB/3KB Investigate the effects of changing A, H, and K in the vertex form of a quadratic function. Analyze the effect of these parameters symbolically and graphically. By Hewlett-Packard. 2000/09/09

 Quadratic 1.0   (details) 39/40   2KB/1KB This program uses the quadratic formula to solve a quadratic equation and gives the exact answer, also gives imaginary answers. By Pavel Poutchkarev. 2001/03/10

 Quadratic Focus & Directrix   (details) 39/40 ENG   12KB/2KB This is an aplet which lets you explore the relationship between the focus and the directrix of a quadratic equation/graph. By Colin Croft. 2003/05/20

 Quadratic Formula 0.9   (details) 39/40 ENG   147KB/2KB This is an applet that solves the quadratic formula for you. Made in System RPL. Source code included. Dutch version included. By Michaël De Coninck. 2003/05/08

 Quadratic Formula 1.0   (details) 39/40 ENG   1KB/1KB Solve for the value of x using the quadratic formula. By Alex Seifert. 2002/03/09

 Quadratics Pack 1.0   (details) 39/40 ENG   38KB/3KB This is a collection of programs that help you with quadratic equations. At the moment there are programs to find x-intercept, axis of symmetry and the turning point. By Geek Boi. 2003/03/06

 Rational   (details) 39/40 ENG   23KB/3KB Investigate rational functions and the asymptotes associated with the function. By Hewlett-Packard. 2000/09/09

 Reflection   (details) 39/40 ENG   17KB/1KB Reflect graphs of functions about the y-axis, x-axis, origin, and the line y=x. By Hewlett-Packard. 2000/09/09

 Residual   (details) 39/40 ENG   47KB/3KB Compute residual values and display their graph as another way to determine how good the regression equation fits the data. By Hewlett-Packard. 2000/09/09

 Right Triangles   (details) 39/40 ENG   13KB/2KB Solve right triangles by using the Pythagorean Theorem and the trigonometric ratios sine, cosine, and tangent. By Hewlett-Packard. 2000/09/09

 Root Finding   (details) 39/40 ENG   26KB/2KB Allows the user to perform some very advanced matrix operations. He says "I'm sending an aplet with my build of Newton-Raphson, bisections and secants algorithms. A full explanation is supplied in PDF format. By Roso Giuseppe (Beppe). 2003/05/20

 Rooty 1.0   (details) 39/40   2KB/1KB This program simplifies roots (not only square ones), gives you the exact and rounded answer. By Pavel Poutchkarev. 2001/03/10

 Rounding Drill   (details) 39/40 ENG   15KB/2KB This aplet which gives the user drill in rounding to a number of decimal places or to a number of significant figures. This is purely a drill program not a teaching aplet. By Colin Croft. 2003/05/20

 Row Operations   (details) 39/40 ENG   15KB/2KB School activity designed to investigate the use of elementary row operations in the reduction and/or solution of a 3 by 3 system of linear equations expressed as an augmented matrix. By Colin Croft. 2003/05/20

 Ruffini 1.0   (details) 39/40 ESP   35KB/7KB Study the division of a polynomial between the binomial x-a using the rule of Ruffini. For the 40G. By José Andrés Jiménez. 2006/05/14

 Simulation Aplet   (details) 39/40 FRA   134KB/6KB Collection of several applications for various statistical calculations. Includes source code. By Jean-Yves Avenard. 2000/10/22

 Simulations   (details) 39/40 ENG   13KB/3KB School activity designed to simulate sets of observations on various discrete and continuous random variables. These can be used in test problems or exercises, or as aids in teaching the topic of random variables. By Colin Croft. 2003/05/20

 Sine Define   (details) 39/40 ENG   30KB/2KB School activity designed to investigate the definitions of sine, cosine and tangent on the Unit circle. These can be used in test problems or exercises, or as aids in teaching the topic of random variables. By Colin Croft. 2003/05/20

 Slope 1.0   (details) 39/40 ENG   1KB/2KB Find the slope of a line on a coordinate graph. By Alex Seifert. 2002/03/09

 Slope Fields   (details) 39/40 ENG   10KB/2KB School activity designed to investigate the production of a field of slopes from a derivative function stored in F1(X), and the drawing of multiple possible integrals given starting points (x,y). By Colin Croft. 2003/05/20

 Statpack 39/40   (details) 39/40 ENG   119KB/8KB A complete statistics package for the 39/40G. Does Chi^2, F-tests, ANOVA, binomial, geometric, Poisson, normal probability plots, residual calculation, a whole lot of simulations, and a whole lot more. Has built in help for all commands in the NOTE. By Tim Wessman. 2001/11/11

 Substitution   (details) 39/40 ENG   12KB/7KB Evaluate expressions when given values for the variables. By Hewlett-Packard. 2000/09/09

 Surd Simplifier   (details) 39/40 ENG   2KB/1KB This is a small but very handy program written by a student who obviously has some interesting ideas. If you enter a surd or an expression involving surds it will return the simplified version. By Dale Shelton. 2003/05/20

 Sweets Box   (details) 39/40 ENG   13KB/1KB School activity designed to investigate a problem in optimization where they are required to maximize the volume or minimize the surface area by manipulating a single variable. By Colin Croft. 2003/05/20

 Tangent   (details) 39/40 ENG ESP   3KB/1KB Get the tangent to a function given in F1(x) in a point you choose. It will be written in F2(x) so you can watch it in the plot view. Really interesting! By Ricardo Blasco Serrano. 2001/05/27

 Tangent Lines   (details) 39/40 ENG   69KB/2KB School activity designed to investigate the change in the gradient of a tangent line as the point of tangency moves along the function. By Colin Croft. 2003/05/20

 The First 50   (details) 39/40 ENG   82KB/1-35KB This is a collection of small programs you can type in yourself or download. They perform a multitude of small tasks, some that are so easy you'll wonder why I wrote a program for them, some that are really cool. By Colin Croft. 2003/05/20

 Time Series   (details) 39/40 ENG   22KB/3KB School activity designed to easily and quickly analyze Time Series style data, by calculating moving averages (3, 4 and 5 point), seasonal residuals, trend lines and seasonally adjusted data. It more a working tool, rather than an investigative tool. By Colin Croft. 2003/05/20

 Transformer   (details) 39/40 ENG   8KB/2KB This is an easy adaption of the Parametric aplet which allows the student to investigate geometric transformations using 2x2 matrices. It is a fantastic teaching tool - my class deduced all the basic 2x2 transformation matrices for themselves in less than an hour. By Colin Croft. 2003/05/20

 Vector Calculations   (details) 39/40 ENG   8KB/6KB This aplet does closest approach problems (including showing full working) in 2D and 3D as well as dot products and division of vectors in a given ratio. There are also two other programs which are not part of the aplet but are worth looking at. By Robert Fyfe. 2003/05/20

 Vector Derivatives   (details) 39/40 ENG   16KB/2KB School activity designed to investigate the relationship between the position, velocity and acceleration vectors for functions defined in the form (x(t),y(t)). By Colin Croft. 2003/05/20

 Window Fix   (details) 39/40 ENG   1KB/1KB Adjusts axes to nice values so cross-hair 'jumps' are to useful points rather than horrible decimals. Trig gives \pi fractions. By Colin Croft. 2003/05/20

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