context: ###List of Questions
  (1) Let x be ((-70)/(-8))/((-1)/(-8)). Suppose 2*n - 5*c - x = 0, 4*n + c = 2 + 94. Solve -2*d + 5*u = -3*d - 5, 5*u + n = 3*d for d.
  (2) Four letters picked without replacement from {x: 8, y: 1, f: 6}. What is prob of sequence xyxx?
  (3) What is thirteen quarters of a decade in months?
  (4) Suppose 4*i - 38 = -b, -3*b + 19 = 2*i - 65. Calculate the remainder when b is divided by 7.
  (5) Product of -0.4 and -0.558.
q_1: (1) Let x be ((-70)/(-8))/((-1)/(-8)). Suppose 2*n - 5*c - x = 0, 4*n + c = 2 + 94. Solve -2*d + 5*u = -3*d - 5, 5*u + n = 3*d for d.
q_2: (2) Four letters picked without replacement from {x: 8, y: 1, f: 6}. What is prob of sequence xyxx?
q_3: (3) What is thirteen quarters of a decade in months?
q_4: (4) Suppose 4*i - 38 = -b, -3*b + 19 = 2*i - 65. Calculate the remainder when b is divided by 7.
q_5: (5) Product of -0.4 and -0.558.