rogue_math.rb

class RogueMath
  def self.add(a, b)
    a + b
  end

  def self.subtract(a, b)
    a - b
  end

  def self.multiply(a, b)
    a * b
  end

  def self.divide(a, b)
    a / b
  end

  def self.square(a)
    a**2
  end
end