1. The first 10 primes are 2, 3, 5, 7, 11, 13, 17, 19, 23, 29.

2. 40 = 8*5 (there may be other answers: 40 = 4 * 10 = 2 * 20 etc.)

3. 40 = 2*2*2*5

4. GCF(8, 12, 40) = 4.

5. sqrt(48) = sqrt(4^2*3) = 4 sqrt(3).

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