please help.

5. Why is it argued that beta is the best measure of a stock's risk? How can a firm influence the size of its beta? 4 points 6. What happens to the SML graph if inflation changes or if risk aversion changes? How will this impact the required returns of stocks with a beta of 0.5, 1.0, or 1.5, respectively? (You do not need to provide calculations on this, but explain what happens.) 5 points F4 F5 F6 F8 F9 F10 F11