context: ###List of Questions
  (1) In base 3, what is 210202 - 10?
  (2) Solve 5*a = -2*h + 15, 0 = -2*h + 6*a - 2*a - 12 for h.
  (3) Three letters picked without replacement from {e: 3, z: 2}. Give prob of sequence eze.
  (4) How many nanograms are there in 3/10 of a microgram?
  (5) Let g = -109 - -229. What is the highest common factor of 80 and g?
q_1: (1) In base 3, what is 210202 - 10?
q_2: (2) Solve 5*a = -2*h + 15, 0 = -2*h + 6*a - 2*a - 12 for h.
q_3: (3) Three letters picked without replacement from {e: 3, z: 2}. Give prob of sequence eze.
q_4: (4) How many nanograms are there in 3/10 of a microgram?
q_5: (5) Let g = -109 - -229. What is the highest common factor of 80 and g?