function add (numberOne, numberTwo) {
	return numberOne + numberTwo; 
}

function subtract (numberOne, numberTwo) {
	return numberOne + numberTwo;; 
}

add(0, 0)
add(2, 2)
add(2,6)

// Do not edit below this line
module.exports = {
  add,
  subtract,
  sum,
  multiply,
  power,
  factorial
};