context: ###List of Questions
  (1) Solve -30 = -14*r + 8*r for r.
  (2) What is fourty-five eighths of a meter in millimeters?
  (3) Suppose -9*j = -11*j + 78. What is the tens digit of j?
  (4) 0.146*1
  (5) What is prob of sequence dn when two letters picked without replacement from ndo?
q_1: (1) Solve -30 = -14*r + 8*r for r.
q_2: (2) What is fourty-five eighths of a meter in millimeters?
q_3: (3) Suppose -9*j = -11*j + 78. What is the tens digit of j?
q_4: (4) 0.146*1
q_5: (5) What is prob of sequence dn when two letters picked without replacement from ndo?