Subject : financial risk management

kindly answer all the following question but a finance tutor needs to answer them within 12 hours

1.What is the meaning of risk return trade off ,explain with examples particularly when you consider an effective combination ofassetsto be included in the portfolio 2.What is the meaning of the beta value of a stock or share? Explain with an example? 3.What is the meaning of the portfolio beta of a stock or share? Explain with an example? 4.Explain different kinds of risks with example and explain business risk and currency exchange risk and financial risk and purchasing power risk and interest rate risk, liquidity risk, tax risk, market risk, event risk and sovereign risk and credit risk with examples and circumstances 5.What is coefficient of variation? Explain its meaning and significance by providing several stocks either to be included or excluded from the portfolio of investment asset of your company