Answers

2014-06-12T18:56:02+08:00
2 and 5. I think so iam not that sure
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2014-06-12T19:00:57+08:00
Number 2, 4 and 5 are quadratic .. 1 and 3 are not quadratic because quadratic equation is a mathematical sentence of the second degree (highest exponent is 2)

1 5 1