Using Dr Racket, write a tail recursive function called popadd that models a population with P people at time t = 0 and adds d people per year

In kotlin, Write a recursive linear search function that takes a String and a Char and returns true if the String contains the Char.  The base cases are that a) the length of the String is 0 or b) the first character in the String is the character we are searching for. then Modify the linear search function so that both the String and the Char are nullable.  If either is null, return false.

I am working on this recursive function, and I am drawing a blank.  Line 15 else if(s.charAt(0) != s.length () -1 && ............ )) Is there a String method that looks for intergers ? Suppose to look to see if it is the last value and if it is a Integer, if it is , add the vaules that intergers together for a total sum  public class Finder { //Write two recursive functions, both of which will parse any length string that consists of digits and numbers. Both functions //should be in the same class and have the following signatures. //use the if/else statement , Find the base case and -1 till you get to base case //recursive function that adds up the digits in the String public static int sumIt(String s) { int sumOfNumbers =0; //if String length is less or equal to 1 retrun 1. for (int i = 0; i >= 0 ;i++) if (s.length()<= 1)//Base case = 1 return 1; //else if the CharAt(value in index at 0 = 1) is not equal to the last vaule in the string else if(s.charAt(0) != s.length ()…

What is s(s(0))*s(s(s(s(0))))*