Your neighbor has a square shaped pool with side lengths of 3a exponent # 5. what's the area of the pool?

Pls! does anybody know a shortcut for answering these types of questions in the future?

What is the number 321,000,000 in scientific notation? also what is the number? ?

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. ?