x makes a linear pair with 120 degrees, so is supplementary:
Answer: 60 degrees
Let's take a peek of each term, to be specific, the exponent of the variables only, to see what degree each term is
![\bf 13-4ab+5a^3b\quad \begin{cases} 13\impliedby \textit{no variable, degree is 0}\\ 4ab\to 4a^1b^1\impliedby \textit{1+1, degree is 2}\\ 5a^3b\to 5a^3b^1\impliedby\textit{3+1, degree is 4} \end{cases}](https://tex.z-dn.net/?f=%5Cbf%2013-4ab%2B5a%5E3b%5Cquad%20%0A%5Cbegin%7Bcases%7D%0A13%5Cimpliedby%20%5Ctextit%7Bno%20variable%2C%20degree%20is%200%7D%5C%5C%0A4ab%5Cto%204a%5E1b%5E1%5Cimpliedby%20%5Ctextit%7B1%2B1%2C%20degree%20is%202%7D%5C%5C%0A5a%5E3b%5Cto%205a%5E3b%5E1%5Cimpliedby%5Ctextit%7B3%2B1%2C%20degree%20is%204%7D%0A%5Cend%7Bcases%7D)
so...which term has the highest degree? well, that one, is the degree of the polynomial
Answer:
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The answer is to the expression is -18