6) One week, Kristi worked 3 days at a department store for 3 1/2 hours each day. She was paid $9 an hour.
a) how many hours did Kristi work that week?
b) how much did Kristi earn that week?
7) Jupiter completes about 2 2/5 rotations every 24 hours. How many rotations does Jupiter complete in one Earth week?
12) the karate club is arranging a grading for its members. It takes 3 1/4 hours to test a group of 4 candidates. How long will the club need the gym in order to process 3 groups of 4 candidates each?