Given that u>0 and v>0 find the smallest possible value of 1/u + 1/v given that u + v = 5 by different methods.

Four vehicles travelled on a road. What can you deduce from the times that they met?

Prove that the graph of f(x) = x^3 - 6x^2 +9x +1 has rotational symmetry. Do graphs of all cubics have rotational symmetry?

Imagine different shaped vessels being filled. Can you work out what the graphs of the water level should look like?

Draw a square and an arc of a circle and construct the Golden rectangle. Find the value of the Golden Ratio.

Explore the hyperbolic functions sinh and cosh using what you know about the exponential function.

Sketch the graphs of y = sin x and y = tan x and some straight lines. Prove some inequalities.

Knowing two of the equations find the equations of the 12 graphs of cubic functions making this pattern.

Here is a pattern composed of the graphs of 14 parabolas. Can you find their equations?

Show without recourse to any calculating aid that 7^{1/2} + 7^{1/3} + 7^{1/4} < 7 and 4^{1/2} + 4^{1/3} + 4^{1/4} > 4 . Sketch the graph of f(x) = x^{1/2} + x^{1/3} + x^{1/4} -x

If x + y = -1 find the largest value of xy by coordinate geometry, by calculus and by algebra.

Which is larger cos(sin x) or sin(cos x) ? Does this depend on x ?

The illustration shows the graphs of twelve functions. Three of them have equations y=x^2, x=y^2 and x=-y^2+2. Find the equations of all the other graphs.

The illustration shows the graphs of fifteen functions. Two of them have equations y=x^2 and y=-(x-4)^2. Find the equations of all the other graphs.

Here are some more quadratic functions to explore. How are their graphs related?

Explore the two quadratic functions and find out how their graphs are related.

Several graphs of the sort occurring commonly in biology are given. How many processes can you map to each graph?

Steve has created two mappings. Can you figure out what they do? What questions do they prompt you to ask?

This set of resources for teachers offers interactive environments to support work on graphical interpretation at Key Stage 4.

Position the lines so that they are perpendicular to each other. What can you say about the equations of perpendicular lines?

Four vehicles travel along a road one afternoon. Can you make sense of the graphs showing their motion?

Which is bigger, n+10 or 2n+3? Can you find a good method of answering similar questions?

Given a set of points (x,y) with distinct x values, find a polynomial that goes through all of them, then prove some results about the existence and uniqueness of these polynomials.

When I park my car in Mathstown, there are two car parks to choose from. Which car park should I use?

Looking at the graph - when was the person moving fastest? Slowest?

This is a beautiful result involving a parabola and parallels.

Two cyclists, practising on a track, pass each other at the starting line and go at constant speeds... Can you find lap times that are such that the cyclists will meet exactly half way round the. . . .

There is a particular value of x, and a value of y to go with it, which make all five expressions equal in value, can you find that x, y pair ?

If x, y and z are real numbers such that: x + y + z = 5 and xy + yz + zx = 3. What is the largest value that any of the numbers can have?

Can you adjust the curve so the bead drops with near constant vertical velocity?

Alison has created two mappings. Can you figure out what they do? What questions do they prompt you to ask?

This task depends on learners sharing reasoning, listening to opinions, reflecting and pulling ideas together.

Two problems about infinite processes where smaller and smaller steps are taken and you have to discover what happens in the limit.

Here is a pattern for you to experiment with using graph drawing software. Find the equations of the graphs in the pattern.

Explore the relationship between quadratic functions and their graphs.

Explore the relationship between resistance and temperature

Can you work out which processes are represented by the graphs?

Find all the turning points of y=x^{1/x} for x>0 and decide whether each is a maximum or minimum. Give a sketch of the graph.

Here are several equations from real life. Can you work out which measurements are possible from each equation?

What biological growth processes can you fit to these graphs?

Two buses leave at the same time from two towns Shipton and Veston on the same long road, travelling towards each other. At each mile along the road are milestones. The buses' speeds are constant. . . .

I took the graph y=4x+7 and performed four transformations. Can you find the order in which I could have carried out the transformations?

Can you draw the height-time chart as this complicated vessel fills with water?

Which curve is which, and how would you plan a route to pass between them?

Various solids are lowered into a beaker of water. How does the water level rise in each case?