Using an online code editor, 1. Write a method to calculate mathematical function. f(x,y) = Vx2 + y2 2. Write a method to calculate mathematical function. e-x/2 V21 3. The monthly payment c of a mortgage of n months with monthly interest rate r for a principal p is given by the mathematical formula, C- pr(1+r)" (1+r) - 1 Write a method to calculate the monthly payment. 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(String s) to return a substring of s with the center character removed. For example, remove("Program") will return the string "Proram" 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 ast name.es. Doe