What is the factored form of r^27 - s^30

True or false look at the picture pls : /

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. ?

Which expression is a perfect cube? a. x8 b. y24 c. m28 d. x64