Someone help me please! With 3 and 4

What is f(3) for the quadratic function f(x)= 2x^2+ + x - 12

What could explain what happened when the time was equal to 120 minutes

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. ?