4. The publisher of a newspaper estimates its revenue (money earned in thousands of dollars) can be modelled with the equation below where x is the number of subscribers (in thousands). R=32x 0.21x2 The cost (money spent in thousands of dollars) can be modelled with the equation below where x is the number of subscribers (in thousands). C=195+12x Determine how many subscribers are needed for the company to "break even". Break even is when their profit is $0 or when their revenue matches the cost. [5 marks]