context: ###List of Questions
  (1) How many millennia are there in 6.620795 decades?
  (2) Three letters picked without replacement from {x: 6, l: 4, m: 9}. Give prob of picking 2 l and 1 m.
  (3) Let i(c) = -c**3 + 5*c**2 + 5*c + 6. Let r be i(6). Suppose 5*p = 10 + 5. Solve 5*b + z = 13, r = 5*b - p*z - z - 23 for b.
  (4) Let g(n) = 31*n + 1 + 2 - 30*n. Suppose -m - 4*m = -30. What is the units digit of g(m)?
  (5) ((-36)/15)/((-176)/(-440))
q_1: (1) How many millennia are there in 6.620795 decades?
q_2: (2) Three letters picked without replacement from {x: 6, l: 4, m: 9}. Give prob of picking 2 l and 1 m.
q_3: (3) Let i(c) = -c**3 + 5*c**2 + 5*c + 6. Let r be i(6). Suppose 5*p = 10 + 5. Solve 5*b + z = 13, r = 5*b - p*z - z - 23 for b.
q_4: (4) Let g(n) = 31*n + 1 + 2 - 30*n. Suppose -m - 4*m = -30. What is the units digit of g(m)?
q_5: (5) ((-36)/15)/((-176)/(-440))