1 and 19
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It is composite because it is a positive integer greater than 1 which is not prime.In other words it is composite because there are other positive integers, beyond 1 and the number itself (57), which will evenly divide into it. 57 also evenly divides by 3 and 19.
None!!! Because '171' is NOT an EVEN number. Remember even numbers end in 0,2,4,6,and 8. Since '171', does not end in 0,2,4,6 or 8 , then it is not an even number, so it will not divide evenly. NB However, you can divide '171' by '2' , and the answer is 85.5 or 85 1/2
3 if you r talking about both
8n - 15 = 57 (add 15 to both sides)8n - 15 + 15 = 57 + 158n = 72 (divide both sides by 8)8n/8 = 72/8n = 9
If the equation is 6a = 57, then divide both sides by 6.