context: ###List of Questions
  (1) What is the value of (-1)/((-2)/(-5))*4/(-5)?
  (2) Suppose 0 = -3*a + 3*r + 201, -4*a + 4*r + 196 = -a. Calculate the highest common factor of 8 and a.
  (3) Let t be (-12)/54 + 536/(-18). Let c be 4/t - (-274)/30. Solve 3*h + 6 = -c for h.
  (4) Two letters picked without replacement from {o: 3, e: 1, n: 3, r: 1, a: 2, d: 3}. Give prob of sequence de.
  (5) How many litres are there in 0.861241 millilitres?
q_1: (1) What is the value of (-1)/((-2)/(-5))*4/(-5)?
q_2: (2) Suppose 0 = -3*a + 3*r + 201, -4*a + 4*r + 196 = -a. Calculate the highest common factor of 8 and a.
q_3: (3) Let t be (-12)/54 + 536/(-18). Let c be 4/t - (-274)/30. Solve 3*h + 6 = -c for h.
q_4: (4) Two letters picked without replacement from {o: 3, e: 1, n: 3, r: 1, a: 2, d: 3}. Give prob of sequence de.
q_5: (5) How many litres are there in 0.861241 millilitres?