There are **16** NRICH Mathematical resources connected to **Functions and their inverses**, you may find related items under Coordinates, Functions and Graphs.

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

Alf Coles writes about how he tries to create 'spaces for exploration' for the students in his classrooms.

By sketching a graph of a continuous increasing function, can you prove a useful result about integrals?

A function pyramid is a structure where each entry in the pyramid is determined by the two entries below it. Can you figure out how the pyramid is generated?

Can you make a curve to match my friend's requirements?

Consider these questions concerning inverting rational functions

Make a functional window display which will both satisfy the manager and make sense to the shoppers

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

Plot the graph of x^y = y^x in the first quadrant and explain its properties.

Crack this code which depends on taking pairs of letters and using two simultaneous relations and modulus arithmetic to encode the message.

Decipher a simple code based on the rule C=7P+17 (mod 26) where C is the code for the letter P from the alphabet. Rearrange the formula and use the inverse to decipher automatically.

We only need 7 numbers for modulus (or clock) arithmetic mod 7 including working with fractions. Explore how to divide numbers and write fractions in modulus arithemtic.

Put a number at the top of the machine and collect a number at the bottom. What do you get? Which numbers get back to themselves?