context: ###List of Questions
  (1) Suppose 20 = 5*f - 10. Let g = f - 15. Let y = 15 + g. Solve -4*i - y = -7*i for i.
  (2) 0.5 times 0.43
  (3) Three letters picked without replacement from bbrtbrububtbjutbu. Give prob of sequence tbr.
  (4) Convert 483.935ms to seconds.
  (5) Let d(l) = l**2 - 3*l. Let x = 2 + 0. Suppose -x*b + 13 = 1. Calculate the remainder when d(5) is divided by b.
q_1: (1) Suppose 20 = 5*f - 10. Let g = f - 15. Let y = 15 + g. Solve -4*i - y = -7*i for i.
q_2: (2) 0.5 times 0.43
q_3: (3) Three letters picked without replacement from bbrtbrububtbjutbu. Give prob of sequence tbr.
q_4: (4) Convert 483.935ms to seconds.
q_5: (5) Let d(l) = l**2 - 3*l. Let x = 2 + 0. Suppose -x*b + 13 = 1. Calculate the remainder when d(5) is divided by b.