please help with only Numbers 11,13,15 and 19.

Write C++ expressions. the problems that require a Boolean expression will provide a condition in which you must write an expression that evaluates to true only for values that makes the conditions true. The problems will provide variables that you must use to write the expressions. You cannot use any additional variables.

11. Determines if an integer, n, is a negative four digit number. 12. Operands {2,3,3,8} 13. Determines if an integer, y, is a perfect square of an odd number between 1 and 10. I. 14. Operands = {3,5,6,7} 15. Determines if a string, word, equals "so" ignoring case. 16. Operands = {2,2,6,8} 17. Operands {1,2,5,9} 18. Operands = {1,4,6,9} 19. Determines if an integer, m, is divisible by two distinct single digit prime numbers. 20. Operands = {2,6,8,9} 21. Operands = {3,6,6,9}