What is the expression equicalent to a2-144b2

Which expressions are equivalent to -6 + 3m

Triangle xyz has vertices x(1,3), y(0,0)

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. ?