I made it

index.js

@@ -1,11 +1,17 @@
 /*******************************************
     Iteration 1.1 | Tongue Twister
 *******************************************/
+
+
 const s1 = "Fred";
 const s2 = "fed";
 const s3 = "Ted";
 const s4 = "bread";
 const s5 = "and";
+let tongueTwister;
+tongueTwister=s1+` `+s2+` `+s3+` `+s4+` `+s5+` `+s4+` `+s3+` `+s2+` `+s1;
+
+console.log(tongueTwister);
 
 // Concatenate the string variables into one new string
 
@@ -20,7 +26,10 @@ const s5 = "and";
 *******************************************/
 const part1 = "java";
 const part2 = "script";
-
+let chr1=part1[part1.length-1].toUpperCase();
+let chr2=part2[part2.length-1].toUpperCase();
+let final=part1.slice(0,part1.length-1)+chr1+part2.slice(0,part2.length-1)+chr2;
+console.log(final)
 // Convert the last letter of part1 and part2 to uppercase and concatenate the strings
 
 
@@ -33,6 +42,8 @@ const part2 = "script";
     Iteration 2.1 | Calculate Tip
 *******************************************/
 const billTotal = 84;
+let tipAmount=billTotal*0.15;
+console.log(tipAmount)
 
 // Calculate the tip (15% of the bill total)
 
@@ -45,10 +56,12 @@ const billTotal = 84;
 /*******************************************
     Iteration 2.2 | Generate Random Number
 *******************************************/
-
+
+ let N=10;
 // Generate a random integer between 1 and 10 (inclusive)
 
-
+let randomNumber=Math.floor(Math.random()*(N+1));
+console.log(randomNumber);
 // Print the generated random number
 
 
@@ -62,15 +75,26 @@ const b = false;
 
 // Try and guess the output of the below expressions first and write your answers down:
 const expression1 = a && b;
+//false
 
 const expression2 = a || b;
+//true
 
 const expression3 = !a && b;
+//false
 
 const expression4 = !(a && b);
+//true
 
 const expression5 = !a || !b;
+//true
+
 
 const expression6 = !(a || b);
+//false
+
+
+const expression7 = a && a;
+//true
 
-const expression7 = a && a;
+console.log(expression1,expression2,expression3,expression4,expression5,expression6,expression7)