context: ###List of Questions
  (1) What is next in -73, -66, -55, -40, -21?
  (2) Calculate 270 divided by -45.
  (3) Let d be 354/(-10) + (-12)/(-30). Let o = 1105 - 2151/2. Calculate the common denominator of 3 - 3/(6/d) and o.
  (4) Convert 2604871.2 microseconds to minutes.
  (5) What is prob of picking 3 w when three letters picked without replacement from wsssssswswssswwssw?
q_1: (1) What is next in -73, -66, -55, -40, -21?
q_2: (2) Calculate 270 divided by -45.
q_3: (3) Let d be 354/(-10) + (-12)/(-30). Let o = 1105 - 2151/2. Calculate the common denominator of 3 - 3/(6/d) and o.
q_4: (4) Convert 2604871.2 microseconds to minutes.
q_5: (5) What is prob of picking 3 w when three letters picked without replacement from wsssssswswssswwssw?