context: ###List of Questions
  (1) What is the remainder when 4 is divided by -4*(9/(-4))/3?
  (2) Solve 30 - 9 = 7*t for t.
  (3) Four letters picked without replacement from {a: 5, i: 1, v: 2, t: 5, n: 4, w: 3}. Give prob of picking 1 t, 2 w, and 1 a.
  (4) What is 5.346329 nanograms in grams?
  (5) Evaluate 7 + (-1 - -6) + 13 + -21.
q_1: (1) What is the remainder when 4 is divided by -4*(9/(-4))/3?
q_2: (2) Solve 30 - 9 = 7*t for t.
q_3: (3) Four letters picked without replacement from {a: 5, i: 1, v: 2, t: 5, n: 4, w: 3}. Give prob of picking 1 t, 2 w, and 1 a.
q_4: (4) What is 5.346329 nanograms in grams?
q_5: (5) Evaluate 7 + (-1 - -6) + 13 + -21.