Which algebraic expression is a polynomial?

4x2 – 3x + startfraction 2 over x endfraction
–6x3 + x2 – startroot 5 endroot
8x2 + startroot x endroot
–2x4 + startroot 3 over 2 x endroot the answer is i just took the test

Manuela claims that and are congruent. which statement best describes her claim? she is incorrect because the segments do not have the same orientation. she is incorrect because the segments do not have the same length. she is correct because the segments have the same length. she is correct because the segments have the same orientation.