What's the square root of pie times 7

Aiden drives to school and back each day. the school is 16 miles from his home. he averages 40 miles per hour on his way to school. if his trip takes 1 hour, at approximately what speed does aiden drive home?

The hawaiian alphabet has 12 letters. how many permutations are posible for each number of letters?

Aflower has 26 chromosomes. to create a new flower,how many would a sperm cell have what is called?