problem Agile algebra Age 16 to 18 Challenge level Observe symmetries and engage the power of substitution to solve complicated equations.
problem Loch Ness Age 16 to 18 Challenge level Draw graphs of the sine and modulus functions and explain the humps.
problem Operating machines Age 16 to 18 Challenge level What functions can you make using the function machines RECIPROCAL and PRODUCT and the operator machines DIFF and INT?