context: ###List of Questions
  (1) Let k(s) = s**3 - 4*s**2 - 6*s + 7. Let m be (-3)/2 - (-104)/16. What is the units digit of k(m)?
  (2) Solve 5*u + 3*w = 4*u + 4, 20 = 5*u + 4*w for u.
  (3) Two letters picked without replacement from {f: 2, z: 4, y: 8, b: 1}. What is prob of sequence yf?
  (4) Total of 0.4 and 297491.
  (5) Convert 0.056769 decades to millennia.
q_1: (1) Let k(s) = s**3 - 4*s**2 - 6*s + 7. Let m be (-3)/2 - (-104)/16. What is the units digit of k(m)?
q_2: (2) Solve 5*u + 3*w = 4*u + 4, 20 = 5*u + 4*w for u.
q_3: (3) Two letters picked without replacement from {f: 2, z: 4, y: 8, b: 1}. What is prob of sequence yf?
q_4: (4) Total of 0.4 and 297491.
q_5: (5) Convert 0.056769 decades to millennia.