Write an equation you could use to find the length of the missing side of each triangle. then find the missing length. round to the nearest tenth if necessary.

Which of the following of the following sets of side lengths could not form a triangle?

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. ?

Over which interval is the graph of f(x) = x2 + 5x + 6 increasing?