Which classes dont have constructors in java.

Arla made a spreadsheet in excel showing the projected costs for a concert she was putting on. what can marla enter into cell a11 to find out how much money is left in her budget and to make sure the cell is updated whenever she changes any of the other costs?

Budgets you to do all of the following expect a) send frivolously b) avoid over spending c) gain financial independence d) examine your priorities and goals

Which of these is most responsible for differences between the twentieth century to the twenty-first century?