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1. 34. Note that \(37-4 = 33\text{,}\) but this calculation would not include 4 itself.

2. 103. Again, you could compute this by \(100-(-2)+1\text{,}\) or simply count: 100 numbers from 1 through 100, plus -2, -1, and 0.

3. 8. There are 8 primes not greater than 20: \(\{2, 3, 5, 7, 11, 13, 17, 19\}\text{.}\)