A sketch is a hand drawn diagram, graph or chart. The 1/3 refers to the size it needs to be. So your sketch has to fill one third of a page (usually of a4).
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You may have noticed a small sketch or drawing right next to the question, right there on the page where you copied it from. That little drawing or sketch is absolutely necessary in order to answer the question. There's no way to answer the question without it.
i need to know how to function rule and a sketch of a graph
you dont...
The best way to sketch a graph of the function y -2x 2-4x-6 is to first get the values of Y and X and then use the values to sketch the graph.
OK. Done. Now what ?