Writea heigher order function dup2 to double each element of an integer list as an integer list list. dup2([2,3,5)] > [[2,2], [3,3],[5,5]].

Need help with sml programming language. I need to define a function called countNegative (val countNegative = fn : int list -> int) that takes a list of integers as an argument and that returns a count of the number of negative integers in the list. For example, countNegative([3,17,~9,34,~7,2]) should return 2.

Please help with this!! in c++!

SCHEME Sub All Write sub-all, which takes a list s, a list of old words, and a list of new words; the last two lists must be the same length. It returns a list with the elements of s, but with each word that occurs in the second argument replaced by the corresponding word of the third argument. You may use substitute in your solution. Assume that olds and news have no elements in common. (define (sub-all s olds news)  'YOUR-CODE-HERE )