Case 1 = 4 blocks case 2 = 9 blocks case 3 =16 blocks. How many blocks are need for the 9th case?

9514 1404 393

  100

Step-by-step explanation:

4 = 2² . . . case 1

9 = 3² . . . case 2

16 = 4² . . . case 3

The number of blocks is the square of the number 1 greater than the case number. For case 9, the number of blocks is (9+1)² = 10² = 100.

  100 blocks are needed for the 9th case.

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