video1.0<iframe src="https://www.loom.com/embed/497c97383d704128af41a50417d8c789" frameborder="0" width="1620" height="1215" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe>12151620Loomhttps://www.loom.com12151620https://cdn.loom.com/sessions/thumbnails/497c97383d704128af41a50417d8c789-a46c8469b0cd1bbf.gif310Please note OL students only need to be able to part (i). The other two parts (ii) and (iii) in the example would be HL.