//  QUESTION 1
var combineArgs = function( a, b ){
  alert(a + b);
};

combineArgs("This question ", "is easy");


//  QUESTION 2
var highOrLow = function( num, sayHigh, sayLow ){
  if( num > 5 )
    alert(sayHigh);
  else
    alert(sayLow);
};


//  QUESTION 3
highOrLow = function( num, sayHigh, sayLow ){
  if( num > 5 )
    return sayHigh;
  else
    return sayLow;
};

alert( highOrLow( 6, "High number", "Low number" ) );


//  QUESTION 4
var x = function sayBoom(){
  alert("BOOM!");
};

x();


//  QUESTION 5
var callFunction = function( fn ){
  //  checking if argument is a function, otherwise this would error
  //  not really needed as the question says to just assume it is a function
  if( typeof fn === "function" ){
    fn();
  }
};

callFunction( x );