Sorry, rosala...I should have explained more....Phi is the irrational number (1 + √5) / 2 ≈ 1.61803398874989485
If you have regular pentagon of side length = 1, then the length of one of its diagonals turns out to be "Phi"
Also....if you're familiar with the Fibonacci Series.......as the series grows larger, the ratio between a successive term and its preceding term tends towards Phi....!!
Athough you probably have enough studying to do in school....here's a whole website devoted to Phi....http://www.maths.surrey.ac.uk/hosted-sites/R.Knott/Fibonacci/phi.html
(You may find it interesting to just look at a little of it at a time...!!!)
3x²y - y
The degree of a polynomial is the degree of its highest degree term.
The degree of a term is the sum of the exponents of that term's variables.
The term 3x²y has two variables: x has an exponent of 2 and y has an exponent of 1; adding these together, the sum is 3; therefore, the degree of 3x²y is 3. Another way of looking at this: if you write the term completely out, the term would be 3xxy; counting the number of variables (letters), there are three.
The degree of y is 1.
The highest degree is three; therefore, the degree of the polynomial is 3.