Cannonballs can be stacked to form a pyramid with a triangular base.Five of these pyramids are shown below.Use a difference table to predict the number of cannonballs in the sixth pyramid and in the seventh pyramid. (illustrations not included but) a1=1, a2=4, a3=10, a4=20, a5=35a6??7??athAlgebraMATH 115 115

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