context: ###List of Questions
  (1) Let t be (-2 - -3 - 0) + 53. Let z = 10 + -4. Calculate the greatest common factor of z and t.
  (2) What is prob of sequence rpcp when four letters picked without replacement from uppbrrppcrbrurrbrrr?
  (3) Suppose -60 = 5*w - 160. Let p(j) = 1 + 4*j - j - 4*j. Let l be p(-2). Solve 5*i + 5*x + w = 0, 4*x + 8 = -l*i + 3*x for i.
  (4) How many millennia are there in 243937.17 months?
  (5) Calculate 26*-0.6.
q_1: (1) Let t be (-2 - -3 - 0) + 53. Let z = 10 + -4. Calculate the greatest common factor of z and t.
q_2: (2) What is prob of sequence rpcp when four letters picked without replacement from uppbrrppcrbrurrbrrr?
q_3: (3) Suppose -60 = 5*w - 160. Let p(j) = 1 + 4*j - j - 4*j. Let l be p(-2). Solve 5*i + 5*x + w = 0, 4*x + 8 = -l*i + 3*x for i.
q_4: (4) How many millennia are there in 243937.17 months?
q_5: (5) Calculate 26*-0.6.