What has a remainder of 2 when divided by 11?

What number should be added to both sides of the equation to complete this square? x^2-10x=7

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. ?

This is about circle theorems. someone asap : (