input: Write a function to add a given integer mark to each value in a list of marks. The function should take two parameters: marks (a list) and mark (an integer). The function should return a new list where each element is the sum of the corresponding element in the original list and the given mark.
  assert add_marks([87, 56, 99, 54], 4)==[91, 60, 103, 58]
  assert add_marks([10, 20, 30], 5)==[15, 25, 35]
  assert add_marks([70, 80, 90], 0)==[70, 80, 90]
  assert add_marks([], 5)==[]
  assert add_marks([1, 2, 3], -1)==[0, 1, 2]
output: def add_marks(marks, mark):
      return [x + mark for x in marks]