context: ###List of Questions
  (1) Let m be (0/(-3))/(-3) - 37. Let f = -25 - m. What is the units digit of f?
  (2) Calculate -0.2865*-2.
  (3) Solve -27*c + 116 = -46 for c.
  (4) How many nanograms are there in 944.3821 grams?
  (5) Three letters picked without replacement from {x: 14, y: 5, n: 1}. What is prob of sequence xxx?
q_1: (1) Let m be (0/(-3))/(-3) - 37. Let f = -25 - m. What is the units digit of f?
q_2: (2) Calculate -0.2865*-2.
q_3: (3) Solve -27*c + 116 = -46 for c.
q_4: (4) How many nanograms are there in 944.3821 grams?
q_5: (5) Three letters picked without replacement from {x: 14, y: 5, n: 1}. What is prob of sequence xxx?