can you answer both parts 18 and 19

Question 18 1 pts Which statement is most appropriate for explaining a firm's cost of capital? O Pretax cost of equity O Internal Rate of Return Project risk class O Industry product line risk O Aftertax cost of equity Question 19 1 pts What is a primary disadvantage of the dividend growth model compared to the Capital Asset Pricing Model for estimating the cost of equity? O the model's applicability to all corporations O the stability of the computed cost of equity over time O the model is not complicated the ability to apply either current or future tax rates O is the model's consideration of risk