Answers

2014-08-04T19:32:13+08:00
It's a polynomial because, if turned into a fraction which is  \frac{6x-7y+8z}{1} , the denominator is equal to one, making it rational and, therefore, a polynomial
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2014-08-04T19:38:32+08:00
A polynomial - it consists of 3 terms: 6x, -7y, 8z
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