Need in coding language java. Also have to incorporate the Scanner keyboard. please use the code i have just fix the error and do 10.

8. A good rule of thumb is to spend 2-3 hours each week outside of class for every credit hour of a course. For example, for a 4 credit hour course, it's recommended to spend 8 to 12 hours a week studying that subject outside of class. Input the number of credit hours in your schedule and output the recommended range of hours to spend studying. 9. The formula to convert temperature from Fahrenheit to Celsius is: C=579 (F-32) Input the current temperature in Fahrenheit. Output the equivalent Celsius temperature. 10. Galileo showed that only the height of an object determines how much time it takes to fall to the ground. The formula to compute the time, in seconds, for an object to fall from height his: (=v(2h/g) If we're measuring distance in meters, then we use 9.8 as the gravitational constant (g in the formula). Input the height in meters, then output the time in seconds for an object to fall from that height. LangFile.java:53: error: cannot find symbol Scanner keyboard = new Scanner (System. input); symbol: class Scanner location: class LangFile LangFile.java:53: error: cannot find symbol Scanner keyboard = new Scanner (System. input); symbol: class Scanner Location: class LangFile LangFile.java:53: error: cannot find symbol Scanner keyboard = new Scanner (System.input); symbol: variable input Location: class System LangFile.java:54: error: cannot find symbol int credit_hour = input.nextInt(); symbol: variable input Location: class LangFile LangFile.java:61: error: cannot find symbol Scanner keyboard = new Scanner (System. input); symbol: class Scanner Location: class LangFile LangFile.java:61: error: cannot find symbol Scanner keyboard = new Scanner (System.input); A A symbol: class Scanner Location: class LangFile LangFile.java:61: error: cannot find symbol Scanner keyboard = new Scanner (System. input); symbol: variable input Location: class System LangFile.java:62: error: cannot find symbol double temp = input.nextDouble(); symbol: variable input Location: class LangFile S errors codio@exotic-cricket:-/workspace$ A