Mathematics, 23.11.2019 19:31 lulustar13

Donald plays with his wood cubes and decides to make pyramids: p1: 3, p2: 6, p3: 10. he carries on with his pyramids and labels following the same pattern.

a)after making p4, donald realises that he only has 12 wood cubes left. how many more cubes will he need to make p5?
b)work out the number of cubes needed to make p10.

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