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Using an online code editor: 1. Write a method to calculate mathematical function. f(x,y) = 1x2 + y2 2. Write a method to calculate mathematical function. 1 V21 e-x/2 3. The monthly payment of a mortgage of n months with monthly interest rater for a principal p is given by the mathematical formula. pr(1 + r)" (1 + r)" - 1 Write a method to calculate the monthly payment. CE 4. Write a method print3(String s) to print a string three times in three lines with increasing Indentation. For example, print3("Hello"); will print Hello Hello Hello 5. Lets be a string of odd length. Write a method remove(Strings) to return a substring of s with the center character removed. For example, remove("Program") will return the string "Proram". 6. A string variable fullName represents a full name such as "Doe, John". Write a method shortName(String fullName) to return a string of first initial and last name, e.g., "). Doe