context: ###List of Questions
  (1) 0.772226 + -0.5
  (2) Suppose k = 21 - 15. Calculate the greatest common factor of k and 2.
  (3) Two letters picked without replacement from vvdv. Give prob of sequence vv.
  (4) How many milliseconds are there in 238219.4s?
  (5) What is the next term in -9053, -9051, -9049?
q_1: (1) 0.772226 + -0.5
q_2: (2) Suppose k = 21 - 15. Calculate the greatest common factor of k and 2.
q_3: (3) Two letters picked without replacement from vvdv. Give prob of sequence vv.
q_4: (4) How many milliseconds are there in 238219.4s?
q_5: (5) What is the next term in -9053, -9051, -9049?