I believer the answere is a formula hope this helped 
        
                    
             
        
        
        
All of the above
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Answer:
Several of the subsystems evolved during the program through design changes: The parachute system, essential for booster recovery, was redesigned with larger parachutes in 1983. Frangible nuts, used in the space shuttle pad hold down and release system, were redesigned in 2008.
 
        
             
        
        
        
Answer:
def leap_year(y):
  if y % 4 == 0:
      return 1
  else:
      return 0
def number_of_days(m,y):
  if m == 2:
      return 28 + leap_year(y)
  elif m == 1 or m == 3 or m == 5 or m == 7 or m == 8 or m ==10 or m == 12:
      return 31
  elif m == 4 or m == 6 or m == 9 or m == 11:
      return 30
def days(m,d):
  if m == 1:
      return 0 + d
  if m == 2:
      return 31 + d
  if m == 3:
      return 59 + d
  if m == 4:
      return 90 + d
  if m == 5:
      return 120 + d
  if m == 6:
      return 151 + d
  if m == 7:
      return 181 + d
  if m == 8:
      return 212 + d
  if m == 9:
      return 243 + d
  if m == 10:
      return 273 + d
  if m == 11:
      return 304 + d
  if m == 12:
      return 334 + d
def days_left(d,m,y):
  if days(m,d) <= 60:
      return 365 - days(m,d) + leap_year(y)
  else:
      return 365 - days(m,d)
print("Please enter a date")
day=int(input("Day: "))
month=int(input("Month: "))
year=int(input("Year: "))
choice=int(input("Menu:\n1) Calculate the number of days in the given month.\n2) Calculate the number of days left in the given year.\n"))
if choice == 1:
  print(number_of_days(month, year))
if choice == 2:
  print(days_left(day,month,year))
Explanation:
Hoped this helped