1 Write a method to calculate mathematical function. f(x,y)=1?+y 2. Write a method to calculate mathematical function. 3. The monthly payment c 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. 4. Write a method print3(Strings) 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". 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" In java