context: ###List of Questions
  (1) What is eleven tenths of a centimeter in micrometers?
  (2) Four letters picked without replacement from qrqqsrsqskrqqkrqks. Give prob of picking 4 q.
  (3) (3*(-3)/(-6))/((-3)/(-10))
  (4) Let w = 6 + -11. Let r = 60 - w. Calculate the highest common factor of 13 and r.
  (5) Solve 3*b + 7 = 4*k + 3, 2*k = 5*b + 16 for b.
q_1: (1) What is eleven tenths of a centimeter in micrometers?
q_2: (2) Four letters picked without replacement from qrqqsrsqskrqqkrqks. Give prob of picking 4 q.
q_3: (3) (3*(-3)/(-6))/((-3)/(-10))
q_4: (4) Let w = 6 + -11. Let r = 60 - w. Calculate the highest common factor of 13 and r.
q_5: (5) Solve 3*b + 7 = 4*k + 3, 2*k = 5*b + 16 for b.