Which table represents a function

Negative 5 1/12 + negative 4 1/4 + 6 3/4

Which expression is not a polynomial?

It took alice 5 5/6 hours to drive to her grandparents' house for . on the way home, she ran into traffic and it took her 7 3/8 hours. how much longer did the return trip take? write your answer as a proper fraction or mixed number in simplest form. the trip home took __hours longer. ?