context: ###List of Questions
  (1) Two letters picked without replacement from xaxaaanxxaxnxzvxa. Give prob of picking 1 a and 1 v.
  (2) Suppose -4*i + 12 = 3*x, -3*x = -5*i - x + 38. Suppose 5 = 5*a, l - i*l = a - 16. Solve 5*z + 18 = y - 4*y, -11 = l*z + 2*y for z.
  (3) What is 4/75 of a week in seconds?
  (4) What is -4784 divided by 104?
  (5) Let m = 6 + -2. Let n(z) = m - 2 - z**2 - 9*z + 1. What is the remainder when n(-7) is divided by 9?
q_1: (1) Two letters picked without replacement from xaxaaanxxaxnxzvxa. Give prob of picking 1 a and 1 v.
q_2: (2) Suppose -4*i + 12 = 3*x, -3*x = -5*i - x + 38. Suppose 5 = 5*a, l - i*l = a - 16. Solve 5*z + 18 = y - 4*y, -11 = l*z + 2*y for z.
q_3: (3) What is 4/75 of a week in seconds?
q_4: (4) What is -4784 divided by 104?
q_5: (5) Let m = 6 + -2. Let n(z) = m - 2 - z**2 - 9*z + 1. What is the remainder when n(-7) is divided by 9?