It depends on the domain. In the complex domain, a polynomial of order n must have n solutions, although some of these may be multiple solutions.
In the real domain, a polynomial of odd order must have at least one real solution, while a polynomial of even order may have no real solutions.
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yes
The highest power in the equation.
No. A polynomial can have as many degrees as you like.
The "roots" of a polynomial are the solutions of the equation polynomial = 0. That is, any value which you can replace for "x", to make the polynomial equal to zero.
Yes