HELP ASAP (6 + 9m) + (- 4y - 5) + (7m + 6y)

Which of the following are accepted without proof in a logical system? check all that apply.

If f(x)=-x^2+6x-1 and g(x)=3x^2-4x-1,find(f+g)(x)

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. ?