context: ###List of Questions
  (1) Solve 119 - 14 = -15*r for r.
  (2) Convert 68.53801ms to seconds.
  (3) Let k(y) = 31*y - 35. What is the tens digit of k(4)?
  (4) Calculate prob of picking 1 y and 2 v when three letters picked without replacement from {v: 11, y: 3}.
  (5) In base 10, what is -1 - -239?
q_1: (1) Solve 119 - 14 = -15*r for r.
q_2: (2) Convert 68.53801ms to seconds.
q_3: (3) Let k(y) = 31*y - 35. What is the tens digit of k(4)?
q_4: (4) Calculate prob of picking 1 y and 2 v when three letters picked without replacement from {v: 11, y: 3}.
q_5: (5) In base 10, what is -1 - -239?