input: Write a python function to predict future stock prices using linear regression.
  assert predict_stock_price(10) == 105.0
  assert predict_stock_price(20) == 210.0
  assert predict_stock_price(5) == 52.5
output: def predict_stock_price(days):
      # Using a simple linear regression with a hypothetical slope and intercept
      slope = 10.0  # hypothetical slope (change in price per day)
      intercept = 5.0  # hypothetical intercept (initial price)
      
      return slope * days + intercept