Select the expressions that are polynomials. There may be more than one correct answer.
13x
13
+13x
28
-8x
15
+x
7
14x
8
-11x
18
-7x
4
7
\displaystyle \frac{{4}}{{7}}
7
4
+8x
3
7x
27
+6x
3.9
+6x
5
-12x
17
15x
11
-9x
12
+14x
14
-
4
x
20
\displaystyle \frac{{4}}{{x}^{{20}}}
x
20
4
9x
-4
-5x
24
-10x
19
+4x
16
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