context: ###List of Questions
  (1) What is 1/5 of a millennium in centuries?
  (2) Let c(r) = 10*r - 25. What is the remainder when 8 is divided by c(3)?
  (3) Calculate prob of picking 1 d, 2 n, and 1 w when four letters picked without replacement from xcwdxdllwnnxwdnn.
  (4) Let d = 1 - -2. Let w be ((-10)/8)/(d/(-36)). Solve -w = 3*z + 2*z for z.
  (5) 8 * -0.65
q_1: (1) What is 1/5 of a millennium in centuries?
q_2: (2) Let c(r) = 10*r - 25. What is the remainder when 8 is divided by c(3)?
q_3: (3) Calculate prob of picking 1 d, 2 n, and 1 w when four letters picked without replacement from xcwdxdllwnnxwdnn.
q_4: (4) Let d = 1 - -2. Let w be ((-10)/8)/(d/(-36)). Solve -w = 3*z + 2*z for z.
q_5: (5) 8 * -0.65