- Cannonballs can be stacked to form a pyramid with a triangular base. Five of these pyramids are shown below. Use these figures in Exercises 15 and 16. a1 = 1 az = 4 az = 10 a4 = 20 az = 35 15. a. Use a difference table to predict the number of can- nonballs in the sixth pyramid and in the seventh pyramid. b. Write a few sentences that describe the eighth pyramid in the sequence. 16. The sequence formed by the numbers of cannonballs in the above pyramids is called the tetrahedral sequence. The nth-term formula for the tetrahedral sequence is Tetrahedral, = n(n + 1)(n + 2) Find Tetrahedral10-

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